Bump wagtail from 2.10 to 2.11.6
Bump wagtail from 2.10 to 2.11.6

Bumps [wagtail](https://github.com/wagtail/wagtail) from 2.10 to 2.11.6.
- [Release notes](https://github.com/wagtail/wagtail/releases)
- [Changelog](https://github.com/wagtail/wagtail/blob/main/CHANGELOG.txt)
- [Commits](https://github.com/wagtail/wagtail/compare/v2.10...v2.11.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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