Bump pillow from 3.0.0 to 9.0.0 in /assignment2

Bumps [pillow](https://github.com/python-pillow/Pillow) from 3.0.0 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@3.0.0...9.0.0)

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

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Author: dependabot[bot]

assignment2/requirements.txt

@@ -1,7 +1,7 @@
 Cython==0.25.2
 Jinja2==2.8
 MarkupSafe==0.23
-Pillow==3.0.0
+Pillow==9.0.0
 Pygments==2.0.2
 appnope==0.1.0
 argparse==1.2.1