chore(deps): update docker/metadata-action action to v5 (#15)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/push.yaml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: docker/metadata-action@v4
+      - uses: docker/metadata-action@v5
         id: meta
         with:
           images: ghcr.io/mokmok-dev/gcloud-pubsub-push-emulator