Readthedocs sphinx downgrade fix

Author: p1c2u

.readthedocs.yaml

@@ -10,13 +10,17 @@ sphinx:
 formats: all
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-24.04
+  apt_packages:
+    - pipx
   tools:
-    python: "3.9"
+    python: "3.12"
   jobs:
-    post_create_environment:
+    post_system_dependencies:
+      - pipx ensurepath
+    pre_create_environment:
       # Install poetry
-      - pip install poetry
+      - PIPX_HOME=/opt/pipx PIPX_BIN_DIR=/usr/local/bin PIPX_MAN_DIR=/usr/local/share/man pipx install poetry==1.7.1
       # Tell poetry to not use a virtual environment
       - poetry config virtualenvs.create false
     post_install: