Bump wagtail from 6.3.2 to 6.4.1

Bumps [wagtail](https://github.com/wagtail/wagtail) from 6.3.2 to 6.4.1.
- [Release notes](https://github.com/wagtail/wagtail/releases)
- [Changelog](https://github.com/wagtail/wagtail/blob/main/CHANGELOG.txt)
- [Commits](wagtail/wagtail@v6.3.2...v6.4.1)

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

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

example/requirements.txt

@@ -1,3 +1,3 @@
 Django>=4.2,<5.2
-wagtail==6.3.2
+wagtail==6.4.1
 wagtailterms>=0.1.0