For unknown reasons, Python 3.13 generates an error

Possibly related: sphinx-doc/sphinx#7813

Author: joaander

.readthedocs.yaml

@@ -11,7 +11,7 @@ sphinx:
 build:
   os: ubuntu-24.04
   tools:
-    python: "3.13"
+    python: "3.12"
 
 submodules:
   include: all