try to fix build doc

Author: hathach

.readthedocs.yaml

@@ -4,11 +4,18 @@
 
 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/conf.py
 
+# Optionally declare the Python requirements required to build your docs
 python:
-  version: 3.8
   install:
     - requirements: docs/requirements.txt