bump golang 1.20 for kindnetd

Author: aojea

images/kindnetd/Dockerfile

@@ -14,7 +14,7 @@
 
 # first stage build kindnetd binary
 # NOTE: tentatively follow upstream kubernetes go version based on k8s in go.mod
-FROM golang:1.18
+FROM golang:1.20
 WORKDIR /go/src
 # make deps fetching cacheable
 COPY go.mod go.sum ./
@@ -24,6 +24,6 @@ COPY . .
 RUN CGO_ENABLED=0 go build -o ./kindnetd ./cmd/kindnetd
 
 # build real kindnetd image
-FROM registry.k8s.io/build-image/distroless-iptables:v0.1.1
+FROM registry.k8s.io/build-image/distroless-iptables:v0.2.1
 COPY --from=0 --chown=root:root ./go/src/kindnetd /bin/kindnetd
 CMD ["/bin/kindnetd"]