Bump docker/metadata-action from 5.5.1 to 5.6.1 (#258)

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/8e5442c4ef9f78752691e2d8f8d19755c6f78e81...369eb591f429131d6889c46b94e711f089e6ca96)

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

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