Bump docker/metadata-action from 5.5.1 to 5.6.1 in the ci group

Bumps the ci group with 1 update: [docker/metadata-action](https://github.com/docker/metadata-action).


Updates `docker/metadata-action` from 5.5.1 to 5.6.1
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@8e5442c...369eb59)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -59,7 +59,7 @@ jobs:
           password: ${{ secrets.DOCKER_FLUXCD_PASSWORD }}
       - name: Generate images meta
         id: meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         with:
           images: |
             fluxcd/${{ env.CONTROLLER }}