Bump pillow from 8.3.2 to 9.0.0 (#500)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.3.2 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](https://github.com/python-pillow/Pillow/compare/8.3.2...9.0.0)

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

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requirements.txt

@@ -6,7 +6,7 @@ idna==2.10
 Kivy==2.0.0
 Kivy-Garden==0.1.4
 kivymd==0.104.1
-Pillow==8.3.2
+Pillow==9.0.0
 Pygments==2.7.4
 requests==2.25.0
 urllib3==1.26.5