fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-LODASH-15053838

Author: snyk-bot

package.json

@@ -16,7 +16,7 @@
     "react-loader-spinner": "^3.1.14",
     "react-paginate": "^6.3.2",
     "react-router-dom": "^5.2.0",
-    "react-scripts": "3.4.1",
+    "react-scripts": "4.0.0",
     "react-share": "^4.1.0",
     "react-tiny-link": "^3.4.0",
     "styled-components": "^5.1.1",