feat(@ngtools/webpack): support TypeScript 3.8

Author: clydin

packages/ngtools/webpack/package.json

@@ -28,13 +28,13 @@
   },
   "peerDependencies": {
     "@angular/compiler-cli": ">=9.0.0 < 10",
-    "typescript": ">=3.6 < 3.8",
+    "typescript": ">=3.6 < 3.9",
     "webpack": "^4.0.0"
   },
   "devDependencies": {
     "@angular/compiler": "9.0.4",
     "@angular/compiler-cli": "9.0.4",
-    "typescript": "3.7.5",
+    "typescript": "3.8.2",
     "webpack": "4.42.0"
   }
 }