Bump pillow from 10.2.0 to 10.3.0 in /tests

Bumps [pillow](https://github.com/python-pillow/Pillow) from 10.2.0 to 10.3.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@10.2.0...10.3.0)

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

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

tests/requirements_frozen.txt

@@ -55,7 +55,7 @@ parso==0.8.3
 pathspec==0.9.0
 pexpect==4.8.0
 pickleshare==0.7.5
-Pillow==10.2.0
+Pillow==10.3.0
 platformdirs==2.4.1
 prompt-toolkit==3.0.26
 psutil==5.9.0