Update pip (#24)

Signed-off-by: Christian Henkel <[email protected]>

.github/workflows/deploy.yml

@@ -13,6 +13,9 @@ jobs:
             # Checkout the repository
             - name: Checkout repository
               uses: actions/checkout@v2
+            # Update pip
+            - name: Update pip
+              run: pip install --upgrade pip
             # Install the dependencies
             - name: Install dependencies
               run: pip install -r docs/requirements.txt