correct rtd use

Author: AbstractUmbra

.readthedocs.yaml

@@ -3,8 +3,10 @@ build:
     post_create_environment:
       - pip install -U pdm
       - pdm config python.use_venv false
+      - pdm config venv.in_project false
     post_install:
-      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH pdm install --without speedups
+      - pdm use -f $READTHEDOCS_VIRTUALENV_PATH
+      - pdm install --without speedups
   os: ubuntu-22.04
   tools:
     python: "3.11"