ci: add apt-get update target

Author: sbinet

.github/workflows/ci.yml

@@ -43,6 +43,7 @@ jobs:
     - name: Install Linux packages
       if: matrix.platform == 'ubuntu-latest'
       run: |
+        sudo apt-get update
         sudo apt-get install -qq pkg-config libftdi1-dev
 
 ##    - name: Build-Linux-32b