ci: update build.yml (fixed #14) (#15)

Author: dogi

.github/workflows/build.yml

@@ -18,13 +18,13 @@ jobs:
         sudo apt install coreutils p7zip-full qemu-user-static
 
     - name: Checkout CustomPiOS
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         repository: 'guysoft/CustomPiOS'
         path: CustomPiOS
 
     - name: Checkout Project Repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         path: repository
         submodules: true