Merge pull request #21 from rieske/renovate/actions-checkout-4.x

Update actions/checkout action to v4

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
     - name: install lcov
       run: sudo apt-get install lcov
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
     - name: Install nasm
       run: sudo apt install nasm
     - name: create build dir