build(deps): bump alpine from 3.21.0 to 3.21.1

Bumps alpine from 3.21.0 to 3.21.1.

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

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

Dockerfile

@@ -8,7 +8,7 @@ COPY . /src/
 RUN make build CGO_ENABLED=0
 
 #--- Image stage
-FROM alpine:3.21.0
+FROM alpine:3.21.1
 
 COPY --from=go-builder /src/target/dist/jackal-auth-proxy /usr/bin/jackal-auth-proxy