Update Sphinx configuration.

Author: aaugustin

.readthedocs.yml renamed to .readthedocs.yaml

@@ -1,9 +1,9 @@
 version: 2
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-lts-latest
   tools:
-    python: "3.10"
+    python: latest
   jobs:
     post_checkout:
       - git fetch --unshallow