build(build): use snok/install-poetry to install Poetry

Author: jonahsnider

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Install MkDocs
         run: pip install mkdocs
       - name: Install Poetry
-        run: curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python3 && source $HOME/.poetry/env
+        uses: snok/install-poetry@v1.1.1
       - name: Install dependencies with Poetry
         run: poetry install
       - name: Build documentation