fix platformio install sometime failing on GH

Author: nicolas-rabault

.github/workflows/build.yml

@@ -46,6 +46,7 @@ jobs:
 
       - if: matrix.os == 'ubuntu-latest'
         run: |
+          sudo apt-get update
           sudo apt-get install -y lcov
           lcov -d .pio/build/native/ -c -o lcov.info
           lcov --remove lcov.info '*/usr/*' '*/Platforms/*' '*/bootloader/*' '*/.pio/*' '*/HAL/*' '*/test/*' '*/network/*' -o lcov.info
@@ -89,8 +90,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        project_folders:
-          [
+        project_folders: [
             examples/projects/l0,
             examples/projects/Arduino,
             examples/projects/NUCLEO-L432KC,