fix(@angular-devkit/build-optimizer): update to typescript 3.1.3

This fixes issues related to microsoft/TypeScript#27341

Author: alan-agius4

packages/angular_devkit/build_optimizer/package.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "loader-utils": "1.1.0",
     "source-map": "0.5.6",
-    "typescript": "3.1.1",
+    "typescript": "3.1.3",
     "webpack-sources": "1.2.0"
   }
 }