Update sphinx.yml

.github/workflows/sphinx.yml

@@ -22,8 +22,8 @@ jobs:
     - uses: actions/checkout@v1
     - name: Install APT dependencies
       run: |
-        sudo apt upgrade
-        sudo apt install pandoc
+        sudo apt-get upgrade -y
+        sudo apt-get install -y pandoc
     - name: Install Python dependencies
       run: pip install -r docs/requirements.txt
     - name: Sphinx build