Bump pillow from 6.0.0 to 9.3.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.0.0 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](https://github.com/python-pillow/Pillow/compare/6.0.0...9.3.0)

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

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

requirements.txt

@@ -1,5 +1,5 @@
 numpy==1.16.2
-Pillow==6.0.0
+Pillow==9.3.0
 protobuf==3.7.1
 six==1.12.0
 tensorboardX==1.6