💚 Fix documentation build on Read the Docs

.readthedocs.yml

@@ -5,6 +5,12 @@
 # Required
 version: 2
 
+# required since 2023/10 https://blog.readthedocs.com/use-build-os-config/
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.11"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/conf.py
@@ -16,7 +22,6 @@ formats:
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.8
   install:
     - method: pip
       path: .