build(deps): bump alpine from 3.20.3 to 3.21.0 (#1841)

Bumps alpine from 3.20.3 to 3.21.0.

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

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

Dockerfile

@@ -10,7 +10,7 @@ ADD . ./
 ENV CGO_ENABLED=0
 RUN go build -o fake-gcs-server
 
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 RUN apk add --no-cache mailcap
 COPY --from=builder /code/fake-gcs-server /bin/fake-gcs-server
 RUN /bin/fake-gcs-server -h