Bump wagtail from 4.2.4 to 5.2.6 (#1398)

Bumps [wagtail](https://github.com/wagtail/wagtail) from 4.2.4 to 5.2.6.
- [Release notes](https://github.com/wagtail/wagtail/releases)
- [Changelog](https://github.com/wagtail/wagtail/blob/main/CHANGELOG.txt)
- [Commits](wagtail/wagtail@v4.2.4...v5.2.6)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,6 +1,6 @@
 boto3==1.28.36
 Django>=3.2.10,<3.3
-wagtail==4.2.4
+wagtail==5.2.6
 dj-database-url>=1.0.0,<2.0
 psycopg2==2.9.3
 gunicorn==22.0.0