update readthedocs config

.readthedocs.yaml

@@ -1,6 +1,25 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
 version: 2
 
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+# Build documentation in the "source/" directory with Sphinx
+sphinx:
+  builder: html
+  configuration: source/conf.py
+  fail_on_warning: true
+
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
 python:
-     version: 3.8
-     install:
-          - requirements: requirements.txt
+  install:
+  - requirements: requirements.txt