fix: frontend/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-WEBPACKDEVSERVER-10300775
- https://snyk.io/vuln/SNYK-JS-WEBPACKDEVSERVER-10300777

Author: snyk-bot

frontend/package.json

@@ -12,7 +12,7 @@
   },
   "private": true,
   "dependencies": {
-    "@angular-builders/custom-webpack": "^15.0.0",
+    "@angular-builders/custom-webpack": "^18.0.0",
     "@angular-devkit/build-angular": "^15.0.4",
     "@angular-material-extensions/password-strength": "^6.0.0",
     "@angular/animations": "^15.0.4",