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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-TAR-15416075

Author: snyk-io[bot]

packages/react-scripts/package.json

@@ -79,7 +79,7 @@
     "sass-loader": "^10.0.5",
     "semver": "7.3.2",
     "style-loader": "1.3.0",
-    "terser-webpack-plugin": "4.2.3",
+    "terser-webpack-plugin": "5.0.0",
     "ts-pnp": "1.2.0",
     "url-loader": "4.1.1",
     "webpack": "4.44.2",