bump upload-artifact to v4

Author: adietish

.github/workflows/IJ-latest.yml

@@ -24,7 +24,7 @@ jobs:
         run: chmod +x gradlew
       - name: Build with Gradle
         run: ./gradlew build --continue -PideaVersion=LATEST-EAP-SNAPSHOT
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: test-reports