Bump pillow from 8.1.1 to 10.3.0 in /python

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.1 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@8.1.1...10.3.0)

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

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

python/requirements-dev.txt

@@ -7,7 +7,7 @@ isort==5.9.0
 mypy-protobuf==2.4
 mypy<0.791
 pandas==1.1.0                # used in serving_test_gen
-pillow==8.1.1
+pillow==10.3.0
 pip-licenses==3.4.0          # fetch licenses
 pytest-cov==2.10.1
 pytest==6.2.2