Update docker/metadata-action digest to c299e40

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/metadata-action (changelog)	action	digest	c1e5197 → c299e40

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1. .github/workflows/devcontainer.yml:58

• Draft comment:
  The docker/metadata-action digest update looks fine. Please double-check the release notes to ensure there are no breaking changes in this commit compared to the previous one.
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  Confidence changes required: 0% <= threshold 50% None

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