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](docker/metadata-action@8e5442c...369eb59)

---
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/docker-build.yml

@@ -62,7 +62,7 @@ jobs:
       # Extract metadata (tags, labels) the docker image build
       - name: INPUT PREP - Extract Docker metadata from git repository
         id: meta
-        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5.6.1
         env:
           VALIDATOR_IMAGE_DESCRIPTION: "CloudZero Agent Validator"
         with: