build(deps-dev): bump wagtail from 6.1 to 6.1.2

Bumps [wagtail](https://github.com/wagtail/wagtail) from 6.1 to 6.1.2.
- [Release notes](https://github.com/wagtail/wagtail/releases)
- [Changelog](https://github.com/wagtail/wagtail/blob/main/CHANGELOG.txt)
- [Commits](wagtail/wagtail@v6.1...v6.1.2)

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

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