Revert "Merge branch 'dependabot/pip/pillow-10.3.0' into security-upd…

…ates"

This reverts commit 0efd5f5, reversing
changes made to b0bd15f.

requirements.txt

@@ -119,7 +119,7 @@ pbr==1.10.0
 pep8==1.7.0
 # Pillow reverted due to apparent bug with sorl-thumbnail
 # https://sorl-thumbnail.readthedocs.io/en/latest/requirements.html#image-library
-Pillow==10.3.0
+Pillow==9.3.0
 pip==23.3
 pluggy==1.0.0
 prettytable==0.7.2