Bump react-scripts from 3.4.2 to 3.4.3 in /kinto/plugins/admin

Bumps [react-scripts](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-scripts) from 3.4.2 to 3.4.3.
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/create-react-app/commits/HEAD/packages/react-scripts)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

kinto/plugins/admin/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "homepage": "http://localhost:8888/v1/admin/",
   "devDependencies": {
-    "react-scripts": "^3.4.2"
+    "react-scripts": "^3.4.3"
   },
   "dependencies": {
     "babel-polyfill": "^6.23.0",