chore: flutter agent release

Author: ndesai-newrelic

src/content/docs/release-notes/mobile-release-notes/flutter-release-notes/flutter-agent-1116.mdx

@@ -0,0 +1,16 @@
+---
+subject: Flutter agent
+releaseDate: '2025-10-24'
+version: 1.1.16
+downloadLink: 'https://pub.dev/packages/newrelic_mobile/versions/1.1.16'
+---
+
+
+## Bug Fixes
+- Fixed an issue where the NewRelicNavigationObserver would crash when handling routes without a key parameter, such as bottom sheets and modal dialogs.
+- Resolved navigation tracking failures for routes that don't extend PageRoute.
+
+## Enhancements
+- Improved type safety in NewRelicNavigationObserver by removing all dynamic types.
+- Added support for additional route types including CupertinoPage and NoTransitionPage from go_router.
+- Refactored navigation observer code for better maintainability and readability.