Update docker/metadata-action action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/metadata-action	action	major	v5.10.0 → v6

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Release Notes

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

v6

Compare Source

v6.0.0

Compare Source

• Node 24 as default runtime (requires Actions Runner v2.327.1 or later) by @​crazy-max in #​605
• List inputs now preserve # inside values while still supporting full-line # comments by @​crazy-max in #​607
• Switch to ESM and update config/test wiring by @​crazy-max in #​602
• Bump lodash from 4.17.21 to 4.17.23 in #​588
• Bump @​actions/core from 1.11.1 to 3.0.0 in #​599
• Bump @​actions/github from 6.0.1 to 9.0.0 in #​597
• Bump @​docker/actions-toolkit from 0.68.0 to 0.79.0 in #​604
• Bump @​isaacs/brace-expansion from 5.0.0 to 5.0.1 in #​600
• Bump semver from 7.7.3 to 7.7.4 in #​603

Full Changelog: docker/metadata-action@v5.10.0...v6.0.0

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