CI: update actions/upload-artifact to v4

Author: Garados007

.github/workflows/main.yml

@@ -24,15 +24,15 @@ jobs:
     - name: Build
       run: dotnet build --configuration Release --no-restore
     - name: Upload Build Fail Artifacts
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: build-fail-artifact
         path: ${{ github.workspace }}
     - name: Test
       run: dotnet test --no-restore
     - name: Upload Test Fail Artifacts
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: test-fail-artifact