Bump pillow from 8.1.1 to 9.0.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.1 to 9.0.0.
- [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...9.0.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 scipy==1.0.0
 numpy==1.14.0
-Pillow==8.1.1
+Pillow==9.0.0
 tabulate==0.8.2
 tensorflow==1.7.0rc0
 torch==0.3.0.post4