Bump pillow from 5.4.1 to 10.3.0 in /docs

Bumps [pillow](https://github.com/python-pillow/Pillow) from 5.4.1 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@5.4.1...10.3.0)

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

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

docs/requirements.txt

@@ -2,7 +2,7 @@ sphinxcontrib-plantuml==0.18
 recommonmark==0.7.1
 
 
-pillow==5.4.1 
+pillow==10.3.0 
 mock==1.0.1 
 alabaster>=0.7,<0.8,!=0.7.5 
 commonmark==0.9.1