Bump upload-artifact to v4 (#353)

Author: reakaleek

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
         run: ./tests.sh
       - name: Store test results
         if: success() || failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: test-results
           path: |