Bump pillow from 10.2.0 to 10.3.0 in /maraboupy/docs (#789)

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

maraboupy/docs/requirements.txt

@@ -5,4 +5,4 @@ sphinx-rtd-theme==0.5.0
 sphinx-gallery==0.7.0
 recommonmark==0.6.0
 Pygments==2.7.4
-Pillow==10.2.0
+Pillow==10.3.0