Bump pillow from 6.2.0 to 9.0.0 in /examples/pil_example

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.0 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@6.2.0...9.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/pil_example/additional_requirements.txt

@@ -1 +1 @@
-Pillow==6.2.0
+Pillow==9.0.0