chore: update Customer.io native SDKs (iOS 4.3.0, Android 4.17.0)

[github-actions]

Summary

Automated update of Customer.io native SDK dependencies:

• iOS SDK: 4.2.0 → 4.3.0 (Release Notes)

Key Changes

iOS SDK 4.3.0

4.3.0 (2026-03-09)

Features

• Location enrichment (#1019) (6f0549d)

• Android SDK: 4.16.0 → 4.17.0 (Release Notes)

Android SDK 4.17.0

4.17.0 (2026-03-09)

Features

• Location enrichment (#666) (8d856bc)

Testing

• ✅ Flutter analysis passed
• ✅ Unit tests passed
• ✅ iOS compilation verified
• ✅ Android compilation verified
• ✅ Sample app builds successfully

Migration Notes

This update maintains API compatibility. Please test your integration thoroughly and review the release notes linked above for any specific changes that might affect your implementation.

---

🤖 This PR was automatically generated and tested

---

Note

Low Risk
Mostly dependency/version bumps with no logic changes; risk is limited to potential runtime/regression issues from upgraded native SDKs and updated Flutter lockfile resolutions.

Overview
Updates the Customer.io native SDK versions used by the Flutter plugin: Android dependencies are bumped to io.customer.android 4.17.0, and the iOS native_sdk_version in pubspec.yaml is bumped to 4.3.0.

Also updates the sample app’s pubspec.lock to reflect the plugin version bump (customer_io 3.2.2 → 3.3.0) and refreshed transitive dependency resolutions (e.g., matcher, test_api).

^{Written by Cursor Bugbot for commit 3fd1c43. This will update automatically on new commits. Configure here.}