build(deps): bump docker/metadata-action from 4 to 5 (#7)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 4 to 5.
- [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@v4...v5)

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

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

.github/workflows/main.yaml

@@ -55,7 +55,7 @@ jobs:
           password: "${{ steps.auth.outputs.access_token }}"
       - name: Docker meta
         id: metadata
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/authproxy
           # Docker tags based on the following events/attributes

.github/workflows/push-ghcr.yaml

@@ -49,7 +49,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Docker meta
         id: metadata
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/authproxy
           # Docker tags based on the following events/attributes