Bump the docker-dependencies group with 1 update

Bumps the docker-dependencies group with 1 update: golang.


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

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20.6 as builder
+FROM golang:1.21.3 as builder
 
 WORKDIR /workspace