Bump docker/metadata-action from 5.7.0 to 5.8.0

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.7.0 to 5.8.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](902fa8ec7d...c1e51972af)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-version: 5.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/docker.yml

@@ -123,7 +123,7 @@ jobs:
         uses: sigstore/cosign-installer@d58896d6a1865668819e1d91763c7751a165e159 # v3.9.2
 
       - name: Calculate docker image tag
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
         with:
           images: ${{ matrix.repository }}
           flavor: |

.github/workflows/push_complement_image.yml

@@ -55,7 +55,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Work out labels for complement image
         id: meta
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
         with:
           images: ghcr.io/${{ github.repository }}/complement-synapse
           tags: |