[KYUUBI #4800] Update readthedocs.yaml

### _Why are the changes needed?_

- readthedocs.yml shall be readthedocs.yaml.
- Add OS version

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #4800 from yaooqinn/readthedocs.

Closes #4800

ba70cc529 [Kent Yao] Update readthedocs.yaml

Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>

.readthedocs.yaml

@@ -16,23 +16,19 @@
 #
 
 version: 2
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
 
-# Build documentation in the docs/ directory with Sphinx
 sphinx:
   builder: html
   configuration: docs/conf.py
 
-# Build documentation with MkDocs
-#mkdocs:
-#  configuration: mkdocs.yml
-
-# Optionally build your docs in additional formats such as PDF
 formats:
   - pdf
   - epub
 
-# Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
   install:
     - requirements: docs/requirements.txt