Readthedocs sphinx downgrade fix

Author: p1c2u

.readthedocs.yaml

@@ -10,13 +10,15 @@ sphinx:
 formats: all
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-24.04
   tools:
-    python: "3.9"
+    python: "3.12"
   jobs:
     post_create_environment:
+      # Install pipx
+      - sudo apt install pipx
       # Install poetry
-      - pip install poetry
+      - pipx install poetry==1.7.1
       # Tell poetry to not use a virtual environment
       - poetry config virtualenvs.create false
     post_install: