[Doc] readthedocs: configuration key build.image is deprecated, chang…

…ed to build.os (#71)

* update to new configuration keys

* add tools key to config

* fix indentation

* remove deprecated key for python version

.readthedocs.yaml

@@ -2,14 +2,14 @@
 version: 2
 
 build:
-    image: latest
-
+    os: ubuntu-22.04
+    tools:
+      python: "3.11"
 sphinx:
   builder: html
   configuration: doc/conf.py
 
 python:
-    version: 3.8
     install:
         - requirements: requirements/requirements-docs.txt
         - method: pip