fix(@angular-devkit/build-angular): allow only patch version of webpack (#12870)

Fix #12866

Author: filipesilva

packages/angular_devkit/build_angular/package.json

@@ -48,7 +48,7 @@
     "tree-kill": "^1.2.0",
     "uglifyjs-webpack-plugin": "^1.2.5",
     "url-loader": "^1.0.1",
-    "webpack": "^4.15.1",
+    "webpack": "4.16.4",
     "webpack-dev-middleware": "^3.1.3",
     "webpack-dev-server": "^3.1.4",
     "webpack-merge": "^4.1.2",

yarn.lock

@@ -8683,7 +8683,7 @@ webpack-subresource-integrity@^1.1.0-rc.4:
   dependencies:
     webpack-core "^0.6.8"
 
-webpack@^4.0.0, webpack@^4.15.1, webpack@^4.6.0:
+webpack@4.16.4, webpack@^4.0.0, webpack@^4.6.0:
   version "4.16.4"
   resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.16.4.tgz#6b020f76483bc66339164c296d89978aa100d37a"
   integrity sha512-RqUfwp4qMqv3oFwBQQOoK69C2tdu2FHJEqPABPqgjGDvOIOLqkTOhmmdJjpiRabzNAAH1ahmkA3z4xowlHN+VA==