gh-actions: Make sure apt is updated

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

Author: JohnAZoidberg

.github/workflows/firmware.yml

@@ -96,6 +96,7 @@ jobs:
       - run: cargo install cargo-make
 
       - run: |
+          sudo apt-get update
           sudo apt-get install -y libudev-dev
           cargo make clippy --cwd b1display
           cargo make clippy --cwd c1minimal