Update dependency @angular-builders/custom-webpack to v18

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "zone.js": "~0.14.0"
   },
   "devDependencies": {
-    "@angular-builders/custom-webpack": "^17.0.0",
+    "@angular-builders/custom-webpack": "^18.0.0",
     "@angular-devkit/build-angular": "^18.0.0",
     "@angular/cli": "~18.0.0",
     "@angular/compiler-cli": "^18.0.0",