build(docs-infra): upgrade @angular/cli to 7.0.0-rc.2 (#26394)

PR Close #26394

aio/package.json

@@ -93,8 +93,8 @@
     "zone.js": "^0.8.26"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^0.8.3",
-    "@angular/cli": "^6.2.3",
+    "@angular-devkit/build-angular": "~0.9.0-rc.1",
+    "@angular/cli": "^7.0.0-rc.2",
     "@angular/compiler": "^7.0.0-rc.0",
     "@angular/compiler-cli": "^7.0.0-rc.0",
     "@angular/language-service": "^7.0.0-rc.0",

aio/scripts/_payload-limits.json

@@ -3,9 +3,9 @@
     "master": {
       "uncompressed": {
         "runtime": 3173,
-        "main": 483844,
-        "polyfills": 53920,
-        "prettify": 14913
+        "main": 482960,
+        "polyfills": 53926,
+        "prettify": 14917
       }
     }
   }