fix: packages/react-devtools-extensions/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-SHAJS-12089400

Author: snyk-bot

packages/react-devtools-extensions/package.json

@@ -68,6 +68,6 @@
     "workerize-loader": "^1.3.0"
   },
   "dependencies": {
-    "web-ext": "^4"
+    "web-ext": "^6.1.0"
   }
 }