gh-actions: Make sure apt is updated

Signed-off-by: Daniel Schaefer <[email protected]>

Author: JohnAZoidberg

.github/workflows/firmware.yml

@@ -94,6 +94,8 @@ jobs:
         run: rustup show
 
       - run: |
+          sudo apt-get update
+          sudo apt-get install -y libudev-dev
           cargo clippy -p b1display -- --deny=warnings
           cargo clippy -p c1minimal -- --deny=warnings
           cargo clippy -p ledmatrix -- --deny=warnings