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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-14114940
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-14125745
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-14125097

Author: snyk-bot

package.json

@@ -162,7 +162,7 @@
     "react-test-renderer": "^16.14.0",
     "stylelint": "^14.14.0",
     "stylelint-config-standard-scss": "^5.0.0",
-    "webpack-dev-server": "^3.11.3",
+    "webpack-dev-server": "^4.7.3",
     "yargs": "^17.6.0"
   },
   "resolutions": {