build: update webpack to version 4.42.1

Author: renovate-bot

packages/angular_devkit/build_angular/package.json

@@ -61,7 +61,7 @@
     "tree-kill": "1.2.2",
     "terser": "4.6.7",
     "terser-webpack-plugin": "2.3.5",
-    "webpack": "4.42.0",
+    "webpack": "4.42.1",
     "webpack-dev-middleware": "3.7.2",
     "webpack-dev-server": "3.10.3",
     "webpack-merge": "4.2.2",