Update main.yml

change v3 to v4 of upload-artifacts

Author: sventhiel

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
           upgrade-assistant analyze BExIS%2B%2B.sln --format json > upgrade-report.json
 
       - name: Upload report artifact
-        uses: actions/upload-artifact@v3.1.3
+        uses: actions/upload-artifact@v4
         with:
           name: upgrade-report
           path: upgrade-report.json