build(aio): upgrade to @angular/cli@1.6.3 (#21350)

This change introduces a size regression of 9kb for main.js :-(

I filed an issue for this: https://github.com/angular/angular-cli/issues/9108

-rw-r--r--  1 iminar  eng   72546 Jan  5 19:27 dist.cli-1.6.3/0.86a7a08f7866e6cdc36f.chunk.js
-rw-r--r--  1 iminar  eng   14893 Jan  5 19:27 dist.cli-1.6.3/4.c719ac5645940382cdce.chunk.js
-rw-r--r--  1 iminar  eng    1558 Jan  5 19:27 dist.cli-1.6.3/inline.7722895d8c844f710bcd.bundle.js
-rw-r--r--  1 iminar  eng  466484 Jan  5 19:27 dist.cli-1.6.3/main.faff0e2da95443f759f5.bundle.js
-rw-r--r--  1 iminar  eng   40363 Jan  5 19:27 dist.cli-1.6.3/polyfills.87edf5d695f14a29bf91.bundle.js
-rw-r--r--  1 iminar  eng   54001 Jan  5 19:27 dist.cli-1.6.3/worker-basic.min.js

PR Close #21350

aio/scripts/_payload-limits.json

@@ -3,18 +3,18 @@
     "master": {
       "gzip7": {
         "inline": 941,
-        "main": 116124,
-        "polyfills": 13102
+        "main": 118475,
+        "polyfills": 12962
       },
       "gzip9": {
         "inline": 941,
-        "main": 115954,
-        "polyfills": 13104
+        "main": 118270,
+        "polyfills": 12958
       },
       "uncompressed": {
         "inline": 1558,
-        "main": 456432,
-        "polyfills": 40684
+        "main": 466484,
+        "polyfills": 40363
       }
     }
   }