yaml readthedocs fix

.readthedocs.yml

@@ -9,9 +9,15 @@ version: 2
 sphinx:
   configuration: docs/source/conf.py
 
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.8"
+
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.8
   install:
     - requirements: requirements-dev.txt
     # is important that "-e ." exist in requirements-dev.txt