Bump pillow from 6.2.0 to 9.3.0 in /experiment_setup/master_node

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.0 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@6.2.0...9.3.0)

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

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

experiment_setup/master_node/pip_requirements.txt

@@ -30,7 +30,7 @@ numpy==1.13.1
 packaging==16.8
 pbr==3.1.1
 pika==0.10.0
-Pillow==6.2.0
+Pillow==9.3.0
 protobuf==3.4.0
 py==1.4.33
 pyasn1==0.1.9