Bump docker/metadata-action from 4 to 5

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]>

.github/workflows/ci.yml

@@ -67,7 +67,7 @@ jobs:
         password: ${{ secrets.DOCKER_TOKEN }}
     - name: ℹ️ Extract image metadata
       id: meta
-      uses: docker/metadata-action@v4
+      uses: docker/metadata-action@v5
       with:
         images: |
           webis/targer-backend
@@ -110,7 +110,7 @@ jobs:
         password: ${{ secrets.DOCKER_TOKEN }}
     - name: ℹ️ Extract image metadata
       id: meta
-      uses: docker/metadata-action@v4
+      uses: docker/metadata-action@v5
       with:
         images: |
           webis/targer-frontend