fix: frontend/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577916
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577917
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-7577918
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116

frontend/package.json

@@ -17,7 +17,7 @@
     "@angular-material-extensions/password-strength": "^6.0.0",
     "@angular/animations": "^15.0.4",
     "@angular/cdk": "^14.0.4",
-    "@angular/cli": "^15.0.4",
+    "@angular/cli": "^18.0.0",
     "@angular/common": "^15.0.4",
     "@angular/compiler": "^15.0.4",
     "@angular/compiler-cli": "^15.0.4",
@@ -44,7 +44,7 @@
     "codemirror": "^5.65.14",
     "codemirror-solidity": "^0.2.5",
     "core-js": "^3.22.5",
-    "ethers": "^5.7.2",
+    "ethers": "^6.0.0",
     "file-saver": "^2.0.2",
     "flag-icons": "^6.9.2",
     "font-mfizz": "^2.4.1",