Update dependency @rollup/plugin-url to v6

package.json

@@ -15,7 +15,7 @@
     "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-node-resolve": "^10.0.0",
     "@rollup/plugin-replace": "^2.3.3",
-    "@rollup/plugin-url": "^5.0.1",
+    "@rollup/plugin-url": "^6.0.0",
     "babel-eslint": "^10.0.3",
     "chai": "^4.2.0",
     "chokidar": "^3.4.0",