Bump pillow from 9.0.1 to 9.3.0 in /tests

Bumps [pillow](https://github.com/python-pillow/Pillow) from 9.0.1 to 9.3.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@9.0.1...9.3.0)

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

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

Author: dependabot[bot]

tests/requirements.txt

@@ -4,4 +4,4 @@ paho-mqtt==1.2.3
 pytest-sugar==0.9.4
 pymongo==3.11.2
 requests==2.28.1
-Pillow==9.0.1
+Pillow==9.3.0