CI - Use Node.js 20 actions on GitHub

Author: jonpas

.github/workflows/cpp.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Checkout the source code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: recursive
 
@@ -46,7 +46,7 @@ jobs:
 
     - name: Upload Artifact
       if: always()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: idi-cpp-template-${{ matrix.type }}-${{ matrix.os }}-${{ github.sha }}
         path: build/ctest.xml