Merge pull request #8786 from mhilbrunner/downgrade-python

[3.3] Downgrade Python

.readthedocs.yml

@@ -7,7 +7,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.11"
+    python: "3.9"
 
 sphinx:
   configuration: conf.py