Revert "build(deps): bump google-cloud-storage from 2.7.0 to 2.11.0 in /backend (#2075)"

This reverts commit 98729b2.

Author: marco-c

backend/requirements.txt

@@ -4,7 +4,7 @@ datadog==0.47.0
 Flask==2.2.3
 Flask-Cors==4.0.0
 flask-talisman==1.1.0
-google-cloud-storage==2.11.0
+google-cloud-storage==2.7.0
 gunicorn==21.2.0
 python-dateutil==2.8.2
 pytoml==0.1.21