Change python version for docs.

.readthedocs.yml

@@ -8,15 +8,15 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.8"
+    python: "3.10"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/conf.py
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.8
+  version: 3.10
   install:
     - requirements: docs/requirements.txt
     - requirements: requirements.txt