fix: Update .readthedocs.yml - add required build.os field

Read the Docs now requires build.os. Also updated Python from 3.7 to 3.11.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: AndreRico

.readthedocs.yml

@@ -1,12 +1,16 @@
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
 sphinx:
   configuration: docs/source/conf.py
 
 python:
-  version: 3.7
   install:
     - method: pip
       path: .
       extra_requirements:
-        - docs
+        - docs