update .readthedocs.yml

Author: dguittet

.readthedocs.yml

@@ -9,15 +9,12 @@ version: 2
 sphinx:
   configuration: docs/conf.py
 
-# Build documentation with MkDocs
-#mkdocs:
-#  configuration: mkdocs.yml
-
-# Optionally build your docs in additional formats such as PDF and ePub
-formats: []
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.10"
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
   install:
       - requirements: docs/requirements.txt