chore:(deps): bump react-scripts from 3.4.1 to 3.4.2 in /explorer (#11576)

Bumps [react-scripts](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-scripts) from 3.4.1 to 3.4.2.
- [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[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

explorer/package.json

@@ -30,7 +30,7 @@
     "react-countup": "^4.3.3",
     "react-dom": "^16.13.1",
     "react-router-dom": "^5.2.0",
-    "react-scripts": "3.4.1",
+    "react-scripts": "3.4.2",
     "react-select": "^3.1.0",
     "socket.io-client": "^2.3.0",
     "solana-sdk-wasm": "file:wasm/pkg",