Bump docker/metadata-action from 3 to 4

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3 to 4.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Upgrade guide](https://github.com/docker/metadata-action/blob/master/UPGRADE.md)
- [Commits](docker/metadata-action@v3...v4)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yml

@@ -391,7 +391,7 @@ jobs:
         if: github.event_name != 'pull_request'
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v4
         with:
           images: |
             nginx/nginx-ingress
@@ -516,7 +516,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v4
         with:
           images: |
             ${{ startsWith(github.ref, 'refs/tags/') && 'gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/release/nginx-ic/nginx-plus-ingress' || '' }}

.github/workflows/update-docker-images.yml

@@ -213,7 +213,7 @@ jobs:
         if: ${{ matrix.needs-updating == 'true' }}
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v4
         with:
           images: |
             nginx/nginx-ingress