[CI] Run apt-get update before install (#989)

.github/workflows/main.yml

@@ -189,7 +189,9 @@ jobs:
         uses: actions/checkout@v2
       
       - name: Install dependencies
-        run: sudo apt-get install -y git wget flex bison gperf python3 python3-pip python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y git wget flex bison gperf python3 python3-pip python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
 
       - name: Clone ESP-IDF
         run: |