Bump pillow from 9.1.1 to 9.3.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 9.1.1 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@9.1.1...9.3.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -4,7 +4,7 @@ Flask==2.2.2
 Flask-RESTful==0.3.9
 Flask-SocketIO==5.3.0
 packaging==19.0
-Pillow==9.1.1
+Pillow==9.3.0
 portpicker==1.3.1
 qrcode==7.3.1
 requests==2.21.0