ci: modernize .readthedocs.yaml

.readthedocs.yaml

@@ -1,19 +1,13 @@
-# .readthedocs.yaml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
 version: 2
 
-# Build documentation in the docs/ directory with Sphinx
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+
 sphinx:
    configuration: docs/conf.py
 
-# Optionally build your docs in additional formats such as PDF
-formats: []
-
-# Optionally set the version of Python and requirements required to build your docs
 python:
-   version: "3.8"
-   install:
-   - requirements: docs/requirements.txt
+  install:
+    - requirements: docs/requirements.txt