Bump pillow from 8.2.0 to 8.3.2

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.2.0 to 8.3.2.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/8.2.0...8.3.2)

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

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

requirements.txt

@@ -56,7 +56,7 @@ gym[atari,Box2D]==0.18.0
 tf-agents==0.7.1
 
 ##### Image manipulation
-Pillow==8.2.0
+Pillow==8.3.2
 graphviz==0.16
 opencv-python==4.5.1.48
 pyglet==1.5.0