Update ..docs.ymal

.readthedocs.yaml

@@ -1,13 +1,17 @@
 # Required
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.9"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/source/conf.py
 
 formats: all
 
 python:
-   version: 3.7
    install:
       - requirements: docs/envs/requirements-doc.txt