Bump pillow from 7.0.0 to 8.3.2

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.0.0 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/7.0.0...8.3.2)

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

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

requirements.txt

@@ -50,7 +50,7 @@ pandocfilters==1.4.2
 parso==0.6.2
 pexpect==4.8.0
 pickleshare==0.7.5
-Pillow==7.0.0
+Pillow==8.3.2
 prometheus-client==0.7.1
 prompt-toolkit==3.0.5
 ptyprocess==0.6.0