chore(deps): update dependency @angular-builders/custom-webpack to v19

Author: renovate[bot]

package.json

@@ -54,7 +54,7 @@
     "zone.js": "0.14.10"
   },
   "devDependencies": {
-    "@angular-builders/custom-webpack": "^18",
+    "@angular-builders/custom-webpack": "^19.0.0",
     "@angular-devkit/build-angular": "18.2.20",
     "@angular-devkit/core": "18.2.20",
     "@angular-devkit/schematics": "18.2.20",