Bump pillow from 5.1.0 to 9.0.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 5.1.0 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@5.1.0...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

@@ -36,7 +36,7 @@ olefile==0.45.1
 pandas==0.24.1
 pandas-datareader==0.7.0
 pexpect==4.2.1
-Pillow==5.1.0
+Pillow==9.0.0
 protobuf==3.0.0
 pycairo==1.16.2
 pycodestyle==2.5.0