Bump @typescript-eslint/eslint-plugin in /app/experimenter/static/rapid

Bumps [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) from 3.9.0 to 3.9.1.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v3.9.1/packages/eslint-plugin)

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

app/experimenter/static/rapid/package.json

@@ -27,7 +27,7 @@
     "@types/react-router": "5.1.8",
     "@types/react-router-dom": "5.1.5",
     "@types/react-select": "3.0.19",
-    "@typescript-eslint/eslint-plugin": "3.9.0",
+    "@typescript-eslint/eslint-plugin": "3.9.1",
     "@typescript-eslint/parser": "3.9.0",
     "babel-loader": "8.1.0",
     "eslint": "7.7.0",