Bump golang from 1.19 to 1.21

dependabot[bot] · web-flow · commit 8d8068a9d013 · 2023-08-09T07:33:19.000Z
Bumps golang from 1.19 to 1.21.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] &lt;support@github.com&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.19 as builder
+FROM golang:1.21 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
