build: update @babel/core to version 7.8.3

(cherry picked from commit 85ee225)

Author: clydin

packages/angular_devkit/build_angular/package.json

@@ -11,8 +11,8 @@
     "@angular-devkit/build-optimizer": "0.0.0",
     "@angular-devkit/build-webpack": "0.0.0",
     "@angular-devkit/core": "0.0.0",
-    "@babel/core": "7.7.5",
-    "@babel/preset-env": "7.7.6",
+    "@babel/core": "7.8.3",
+    "@babel/preset-env": "7.8.3",
     "@ngtools/webpack": "0.0.0",
     "ajv": "6.10.2",
     "autoprefixer": "9.6.1",