fix: update read-the-docs poetry install

Task: IL-483

.readthedocs.yaml

@@ -10,19 +10,12 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.11"
-    # You can also specify other tool versions:
-    # nodejs: "19"
-    # rust: "1.64"
-    # golang: "1.19"
   jobs:
+    # according to https://github.com/readthedocs/readthedocs.org/issues/4912#issuecomment-1992286540
     post_create_environment:
-      # Install poetry:
-      - asdf plugin add poetry
-      - asdf install poetry latest
-      - asdf global poetry latest
-      - poetry config virtualenvs.create false
+      - python -m pip install poetry
     post_install:
-      - . "$READTHEDOCS_VIRTUALENV_PATH/bin/activate" && poetry install
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH poetry install
 
 # Build documentation in the "docs/" directory with Sphinx
 sphinx: