chore: Update github actions.

Author: iphydf

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
   build-linux:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Install dependencies
         run: sudo apt-get install -y --no-install-recommends libcmocka-dev
       - name: Build library