Bump the docker group with 2 updates (#5)

Bumps the docker group with 2 updates: golang and alpine.


Updates `golang` from 1.23.3 to 1.23.4

Updates `alpine` from 3.20.3 to 3.21.0

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.23.3 AS builder
+FROM golang:1.23.4 AS builder
 WORKDIR /workspace
 
 COPY go.mod go.mod
@@ -11,7 +11,7 @@ COPY internal/controller/ internal/controller/
 
 RUN CGO_ENABLED=0 go build -a -o manager cmd/main.go
 
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 WORKDIR /
 COPY --from=builder /workspace/manager .
 USER 65532:65532