Bump pillow from 9.0.1 to 12.2.0 in /docs

Bumps [pillow](https://github.com/python-pillow/Pillow) from 9.0.1 to 12.2.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@9.0.1...12.2.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-version: 12.2.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/rtd-requirements.txt

@@ -10,7 +10,7 @@ MarkupSafe==0.23
 Missing==2.13.1
 MultiMapping==2.13.0
 Persistence==2.13.2
-Pillow==9.0.1
+Pillow==12.2.0
 Plone==5.2.5
 Products.ATContentTypes==2.1.15
 Products.ATReferenceBrowserWidget==3.0