build(deps): update pillow requirement

Updates the requirements on [pillow](https://github.com/python-pillow/Pillow) to permit the latest version.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@10.4.0...11.0.0)

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

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

Author: dependabot[bot]

requirements/testing.txt

@@ -2,6 +2,6 @@
 # --------------------
 
 GitPython>=3.1,<3.2
-Pillow>=10.4.0,<10.5
+Pillow>=10.4.0,<11.1
 pytest-cov>=4,<5.1
 validators>=0.29.0,<0.35