Bump pillow in /tools in the pip group across 1 directory (#31640)

Bumps the pip group with 1 update in the /tools directory: [pillow](https://github.com/python-pillow/Pillow).


Updates `pillow` from 11.3.0 to 12.1.1
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/11.3.0...12.1.1)

---
updated-dependencies:
- dependency-name: pillow
  dependency-version: 12.1.1
  dependency-type: direct:production
  dependency-group: pip
...

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

tools/requirements.txt

@@ -1,6 +1,6 @@
 pygit2==1.18.0
 bidict==0.23.1
-Pillow==11.3.0
+Pillow==12.1.1
 json5==0.12.0
 
 # changelogs