Bump willow from 1.11.0 to 1.12.0

Bumps [willow](https://github.com/wagtail/Willow) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/wagtail/Willow/releases)
- [Changelog](https://github.com/wagtail/Willow/blob/main/docs/changelog.rst)
- [Commits](wagtail/Willow@v1.11.0...v1.12.0)

---
updated-dependencies:
- dependency-name: willow
  dependency-version: 1.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -76,7 +76,7 @@ django-flatblocks==1.0.0
 django-storages==1.14.6
 
 djangorestframework==3.16.1
-Willow==1.11.0
+Willow==1.12.0
 text-unidecode==1.3  # for faker
 html5lib==1.1