Bump @angular/forms from 19.2.14 to 20.1.2 in /web_embedding/ng-flutter

---
updated-dependencies:
- dependency-name: "@angular/forms"
  dependency-version: 20.1.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

web_embedding/ng-flutter/package.json

@@ -16,7 +16,7 @@
     "@angular/common": "^19.0.0",
     "@angular/compiler": "^20.0.6",
     "@angular/core": "^20.0.3",
-    "@angular/forms": "^19.0.1",
+    "@angular/forms": "^20.1.2",
     "@angular/material": "^20.1.0",
     "@angular/platform-browser": "^20.0.3",
     "@angular/platform-browser-dynamic": "^20.1.0",