depend(deps): update pillow requirement (#666)

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...11.3.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-version: 11.3.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/mandatory.txt

@@ -7,4 +7,4 @@ asyncio-event-hub>=1.0,<1.2
 tkclasswiz>=1.4,<1.5
 ttkbootstrap==1.10.1
 audioop-lts~=0.2.1; python_version>='3.13'
-pillow>=10.4.0,<11.2.0
+pillow>=10.4.0,<11.4.0