[readthedoc] Upgrade the ubuntu image, downgrade the python interpreter (#9140)

Pierre-Sassoulas · web-flow · commit 317fad2ab3f9 · 2023-10-11T20:40:44.000+02:00
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -11,9 +11,9 @@ python:
     - requirements: doc/requirements.txt
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-22.04
   tools:
-    python: "3.12"
+    python: "3.11"
   jobs:
     pre_build:
       - towncrier build --yes --date TBA
