Make release notes tool not dependent on local git

Now all the date is retrieved through GitHub APIs, making the tool more
portable and easier to use. It should not increase the rate limiting
chances since it now performs less API requests (by getting the label
from all PRs at once instead of with one request per PR).

Author: g-gaston

hack/tools/go.mod

@@ -20,7 +20,6 @@ require (
 	k8s.io/client-go v0.28.4
 	k8s.io/klog/v2 v2.100.1
 	k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9
-	k8s.io/kubectl v0.28.4
 	k8s.io/utils v0.0.0-20231127182322-b307cd553661
 	sigs.k8s.io/cluster-api v0.0.0-00010101000000-000000000000
 	sigs.k8s.io/cluster-api/test v0.0.0-00010101000000-000000000000
@@ -36,7 +35,6 @@ require (
 	cloud.google.com/go/compute v1.23.3 // indirect
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
 	cloud.google.com/go/iam v1.1.5 // indirect
-	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/MakeNowJust/heredoc v1.0.0 // indirect
 	github.com/Masterminds/goutils v1.1.1 // indirect
 	github.com/Masterminds/semver/v3 v3.2.0 // indirect
@@ -48,10 +46,8 @@ require (
 	github.com/asaskevich/govalidator v0.0.0-20200428143746-21a406dcc535 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
-	github.com/chai2010/gettext-go v1.0.2 // indirect
 	github.com/cloudflare/circl v1.3.3 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/daviddengcn/go-colortext v1.0.0 // indirect
 	github.com/distribution/reference v0.5.0 // indirect
 	github.com/docker/distribution v2.8.3+incompatible // indirect
 	github.com/docker/docker v24.0.7+incompatible // indirect
@@ -61,10 +57,7 @@ require (
 	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
 	github.com/evanphx/json-patch v5.6.0+incompatible // indirect
 	github.com/evanphx/json-patch/v5 v5.7.0 // indirect
-	github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d // indirect
-	github.com/fatih/camelcase v1.0.0 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
-	github.com/fvbommel/sortorder v1.1.0 // indirect
 	github.com/go-errors/errors v1.4.2 // indirect
 	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-openapi/jsonpointer v0.19.6 // indirect
@@ -74,64 +67,47 @@ require (
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/google/btree v1.0.1 // indirect
 	github.com/google/cel-go v0.16.1 // indirect
 	github.com/google/gnostic-models v0.6.8 // indirect
 	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/go-github/v53 v53.2.0 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/s2a-go v0.1.7 // indirect
-	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/google/uuid v1.4.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
 	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
-	github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/huandu/xstrings v1.3.3 // indirect
 	github.com/imdario/mergo v0.3.13 // indirect
-	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/jonboulle/clockwork v0.2.2 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect
-	github.com/lithammer/dedent v1.1.0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
-	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
-	github.com/moby/spdystream v0.2.0 // indirect
-	github.com/moby/term v0.0.0-20221205130635-1aeaba878587 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
-	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.0-rc2 // indirect
 	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
-	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
 	github.com/prometheus/client_golang v1.17.0 // indirect
 	github.com/prometheus/client_model v0.4.1-0.20230718164431-9a2bf3000d16 // indirect
 	github.com/prometheus/common v0.44.0 // indirect
 	github.com/prometheus/procfs v0.11.1 // indirect
-	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
 	github.com/shopspring/decimal v1.3.1 // indirect
 	github.com/sourcegraph/conc v0.3.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
-	github.com/spf13/cobra v1.8.0 // indirect
 	github.com/spf13/viper v1.18.1 // indirect
 	github.com/stoewer/go-strcase v1.2.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
-	github.com/xlab/treeprint v1.2.0 // indirect
 	go.opencensus.io v0.24.0 // indirect
-	go.starlark.net v0.0.0-20230525235612-a134d8f9ddca // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/crypto v0.16.0 // indirect
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
@@ -157,13 +133,9 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/apiserver v0.28.4 // indirect
-	k8s.io/cli-runtime v0.28.4 // indirect
 	k8s.io/cluster-bootstrap v0.28.4 // indirect
 	k8s.io/component-base v0.28.4 // indirect
-	k8s.io/component-helpers v0.28.4 // indirect
-	k8s.io/metrics v0.28.4 // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
-	sigs.k8s.io/kustomize/kustomize/v5 v5.0.4-0.20230601165947-6ce0bf390ce3 // indirect
 	sigs.k8s.io/kustomize/kyaml v0.14.3-0.20230601165947-6ce0bf390ce3 // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
 )