PYTHON-3708 Fix ReadTheDocs Build Failure (#1206)

Author: blink1073

.readthedocs.yaml

@@ -12,9 +12,13 @@ sphinx:
 
 # Set the version of Python and requirements required to build the docs.
 python:
-   version: 3.8
    install:
       # Install pymongo itself.
       - method: pip
         path: .
       - requirements: doc/docs-requirements.txt
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"