Chore(deps): Bump golang from 1.21.1-alpine to 1.21.3-alpine

Bumps golang from 1.21.1-alpine to 1.21.3-alpine.

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

Signed-off-by: dependabot[bot] <[email protected]>

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21.1-alpine as builder
+FROM golang:1.21.3-alpine as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests