Bump pillow from 2.4.0 to 8.3.2

Bumps [pillow](https://github.com/python-pillow/Pillow) from 2.4.0 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](python-pillow/Pillow@2.4.0...8.3.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-old.txt

@@ -99,7 +99,7 @@ pathlib2==2.1.0
 pbr==1.8.1
 pexpect==4.2.1
 pickleshare==0.7.4
-Pillow==2.5.0
+Pillow==8.3.2
 prettytable==0.7.2
 prompt-toolkit==1.0.7
 psutil==5.8.0