added "virtualenv<20.26.0" to poetry installation to use a safer version fo virtualenv

Author: HarrySu123

.github/workflows/deploy-docs.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Install Python Dependencies
       run: |
         python -m pip install --upgrade pip setuptools wheel virtualenv
-        python -m pip install poetry
+        python -m pip install "virtualenv<20.26.0" poetry
         poetry config virtualenvs.create false
         poetry install
     - id: deployment