Update docker/metadata-action action to v5.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
docker/metadata-action	action	minor	v5.5.1 -> v5.6.1

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Release Notes

docker/metadata-action (docker/metadata-action)

### [`v5.6.1`](https://redirect.github.com/docker/metadata-action/compare/v5.6.0...v5.6.1) [Compare Source](https://redirect.github.com/docker/metadata-action/compare/v5.6.0...v5.6.1) ### [`v5.6.0`](https://redirect.github.com/docker/metadata-action/compare/v5.5.1...v5.6.0) [Compare Source](https://redirect.github.com/docker/metadata-action/compare/v5.5.1...v5.6.0)

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