Attempt to fix readthedocs build config

.readthedocs.yaml

@@ -1,6 +1,10 @@
 version: 2
 sphinx:
    configuration: docs/conf.py
-python:
+build:
-   install:
+  os: "ubuntu-22.04"
-   - requirements: doc/requirements.txt
+  tools:
+    python: "3.10"
+  jobs:
+    post_create_environment:
+      - cd docs && pip install --exists-action=w --no-cache-dir -r requirements.txt