Remove incorrect python.version field in .readthedocs.yml

.readthedocs.yml

@@ -26,7 +26,7 @@ sphinx:
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.12"
+    python: "3.8"
 
 # Build documentation with MkDocs
 #mkdocs:
@@ -38,6 +38,5 @@ formats:
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.8
   install:
     - requirements: docs/requirements.txt