build(deps): bump wagtail from 6.1.2 to 6.1.3

Bumps [wagtail](https://github.com/wagtail/wagtail) from 6.1.2 to 6.1.3.
- [Release notes](https://github.com/wagtail/wagtail/releases)
- [Changelog](https://github.com/wagtail/wagtail/blob/main/CHANGELOG.txt)
- [Commits](wagtail/wagtail@v6.1.2...v6.1.3)

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

Signed-off-by: dependabot[bot] <support@github.com>