build(deps-dev): bump antora from 3.1.10 to 3.1.12 in /antora

Bumps [antora](https://gitlab.com/antora/antora) from 3.1.10 to 3.1.12.
- [Changelog](https://gitlab.com/antora/antora/blob/main/CHANGELOG.adoc)
- [Commits](https://gitlab.com/antora/antora/compare/v3.1.10...v3.1.12)

---
updated-dependencies:
- dependency-name: antora
  dependency-version: 3.1.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]