ci: change post_create_environment on readthedocs.yaml

.readthedocs.yaml

@@ -11,7 +11,7 @@ build:
   jobs:
     post_create_environment:
       - pip install poetry
-      - pip install --user --requirement < poetry export --only doc --format requirements.txt
+      - poetry config virtualenvs.create false
 
     post_install:
-      - poetry install --only doc
+      - pip install --user --requirement < poetry export --only doc --format requirements.txt