Bump pillow from 8.4.0 to 9.0.1

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.4.0 to 9.0.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.4.0...9.0.1)

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

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Author: dependabot[bot]

requirements.txt

@@ -67,7 +67,7 @@ git+https://github.com/kvesteri/sqlalchemy-continuum.git
 
 # Probably requires
 # sudo apt-get install libtiff5-dev libjpeg8-dev zlib1g-dev libfreetype6-dev liblcms2-dev libwebp-dev libharfbuzz-dev libfribidi-dev
-pillow==8.4.0
+pillow==9.0.1
 
 # probably requires `sudo apt install libxml2-dev libxslt1-dev`
 BeautifulSoup4==4.10.0