fix: frontend/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BRACES-6838727
- https://snyk.io/vuln/SNYK-JS-TOUGHCOOKIE-5672873
- https://snyk.io/vuln/SNYK-JS-MICROMATCH-6838728
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660
- https://snyk.io/vuln/SNYK-JS-GLOBPARENT-1016905

frontend/package.json

@@ -11,7 +11,7 @@
   },
   "private": true,
   "dependencies": {
-    "@angular-devkit/build-angular": "^0.1000.5",
+    "@angular-devkit/build-angular": "^12.0.0",
     "@angular-material-extensions/password-strength": "^6.0.0",
     "@angular/animations": "^10.2.3",
     "@angular/cdk": "^10.1.2",
@@ -48,7 +48,7 @@
     "ngx-cookie-service": "^10.0.1",
     "ngx-spinner": "^10.0.1",
     "ngx-window-token": "^5.0.0",
-    "node-sass": "^4.14.1",
+    "node-sass": "^7.0.2",
     "rxjs": "6.6.2",
     "snarkdown": "^1.2.2",
     "socket.io-client": "^2.3.0",