Bump alpine from 3.23.3 to 3.23.4 in /cmd

Bumps alpine from 3.23.3 to 3.23.4.

---
updated-dependencies:
- dependency-name: alpine
  dependency-version: 3.23.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

cmd/Dockerfile

@@ -18,7 +18,7 @@ COPY . .
 RUN go build -o bin/distributor ./cmd
 
 # Build release image
-FROM alpine:3.23.3@sha256:25109184c71bdad752c8312a8623239686a9a2071e8825f20acb8f2198c3f659
+FROM alpine:3.23.4@sha256:5b10f432ef3da1b8d4c7eb6c487f2f5a8f096bc91145e68878dd4a5019afde11
 
 COPY --from=builder /build/bin/distributor /bin/distributor
 ENTRYPOINT ["/bin/distributor"]