Fix workflow

.github/workflows/mkdocs-deploy.yml

@@ -11,18 +11,25 @@ permissions:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    env:
+      PIPENV_VENV_IN_PROJECT: 'true'
     steps:
       - uses: actions/checkout@v3
 
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.x'
+          python-version: '3.12'
           cache: 'pipenv'
           cache-dependency-path: Pipfile.lock
 
+      - name: Upgrade pip and install Pipenv
+        run: |
+          python -m pip install --upgrade pip
+          pip install pipenv
+
       - name: Install dependencies with Pipenv
-        run: pipenv install --deploy
+        run: pipenv install --deploy --ignore-pipfile
 
       - name: Build the site with MkDocs
         run: pipenv run mkdocs build --strict