Merge pull request #18 from mosfet80/patch-3

Update focal_build.yml

Author: marip8

.github/workflows/focal_build.yml

@@ -28,10 +28,10 @@ jobs:
 
     steps:
       - name: Fetch repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: ccache cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ env.CCACHE_DIR }}
           # we always want the ccache cache to be persisted, as we cannot easily