Update .readthedocs.yaml

https://blog.readthedocs.com/migrate-configuration-v2/

.readthedocs.yaml

@@ -5,25 +5,23 @@
 # Required
 version: 2
 
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/sphinx/conf.py
 
-# Build documentation with MkDocs
-#mkdocs:
-#  configuration: mkdocs.yml
-
 # Optionally build your docs in additional formats such as PDF and ePub
 formats: []
 # formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  # version: 3.8
   install:
+    - requirements: docs/sphinx/requirements.txt
     - method: pip
       path: .
-    - requirements: docs/sphinx/requirements.txt
-
-  # true may break the build?
-  # system_packages: true