Bump pillow from 8.0.1 to 8.1.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.0.1 to 8.1.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.0.1...8.1.0)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -17,7 +17,7 @@ matplotlib==3.3.3
 numpy==1.20.1
 packaging==20.8
 pandas==1.2.2
-Pillow==8.0.1
+Pillow==8.1.0
 pluggy==0.13.1
 psycopg2-binary==2.8.6
 py==1.10.0