build(deps): bump @angular/core in /samples/angular/webapp (#703)

Bumps [@angular/core](https://github.com/angular/angular/tree/HEAD/packages/core) from 2.0.0 to 10.2.5.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/10.2.5/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/10.2.5/packages/core)

---
updated-dependencies:
- dependency-name: "@angular/core"
  dependency-type: direct:production
...

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samples/angular/webapp/package.json

@@ -14,7 +14,7 @@
   "dependencies": {
     "@angular/common": "2.0.0",
     "@angular/compiler": "2.0.0",
-    "@angular/core": "2.0.0",
+    "@angular/core": "10.2.5",
     "@angular/forms": "2.0.0",
     "@angular/http": "2.0.0",
     "@angular/platform-browser": "2.0.0",