Bump pillow from 7.1.2 to 9.3.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.1.2 to 9.3.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@7.1.2...9.3.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -23,7 +23,7 @@ networkx==2.3
 numpy==1.18.4
 opt-einsum==3.2.1
 pandas==0.24.2
-Pillow==7.1.2
+Pillow==9.3.0
 protobuf==3.12.2
 pygraphviz==1.5
 PyGSP==0.5.1