Update Github Actions checkout/upload-artifact versions

.github/workflows/Linux_Build.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Fetch submodules
       run: git submodule update --init --recursive
 
@@ -49,7 +49,7 @@ jobs:
       run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
 
     - name: Upload executable
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: Linux executable
         path: './build/Alber'