build(deps): bump docker/metadata-action from 5.5.1 to 5.6.1

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.5.1 to 5.6.1.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](https://github.com/docker/metadata-action/compare/v5.5.1...v5.6.1)

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

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

.github/workflows/build.yaml

@@ -138,7 +138,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v5.5.1
+        uses: docker/metadata-action@v5.6.1
         with:
           images: "${{ env.IMAGE }}"
           bake-target: docker-metadata-action
@@ -153,7 +153,7 @@ jobs:
 
       - name: Docker meta (debug variant)
         id: meta-debug
-        uses: docker/metadata-action@v5.5.1
+        uses: docker/metadata-action@v5.6.1
         with:
           images: "${{ env.IMAGE }}"
           bake-target: docker-metadata-action-debug
@@ -169,7 +169,7 @@ jobs:
 
       - name: Docker meta (syn2mas)
         id: meta-syn2mas
-        uses: docker/metadata-action@v5.5.1
+        uses: docker/metadata-action@v5.6.1
         with:
           images: "${{ env.IMAGE_SYN2MAS }}"
           bake-target: docker-metadata-action-syn2mas