Bump wagtail from 6.0.5 to 6.0.6

Bumps [wagtail](https://github.com/wagtail/wagtail) from 6.0.5 to 6.0.6.
- [Release notes](https://github.com/wagtail/wagtail/releases)
- [Changelog](https://github.com/wagtail/wagtail/blob/main/CHANGELOG.txt)
- [Commits](wagtail/wagtail@v6.0.5...v6.0.6)

---
updated-dependencies:
- dependency-name: wagtail
  dependency-type: direct:production
...

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