Fix: Required update for ReadTheDocs to build.

readthedocs.yml

@@ -30,11 +30,17 @@
 # =============
 version: 2
 
+# `Required settings <https://docs.readthedocs.io/en/stable/config-file/v2.html#build>`_.
+build:
+    os: "ubuntu-22.04"
+    tools:
+        python: "3.11"
+
 python:
-  install:
-    # To build this documentation, install the required packages. See `requirements <https://docs.readthedocs.io/en/stable/config-file/v2.html#requirements-file>`_.
-    - requirements: docs/docs-requirements.txt
+    install:
+        # To build this documentation, install the required packages. See `requirements <https://docs.readthedocs.io/en/stable/config-file/v2.html#requirements-file>`_.
+        - requirements: docs/docs-requirements.txt
 
 # For some reason, the Read The Docs engine can't find `conf.py`. `Specify it explicitly <https://docs.readthedocs.io/en/stable/config-file/v2.html#sphinx-configuration>`_.
 sphinx:
-  configuration: conf.py
+    configuration: conf.py