Update platform metadata dependencies

[leehack]

Summary

This keeps the update focused on the platform metadata and storage issues I found while working on a Flutter app.

• update device_info_plus to >=11.1.1 <11.2.0 and package_info_plus to ^8.3.1, the minimum versions I found with iOS/macOS Swift Package Manager manifests
• raise the package floor only as far as those minimum versions require: Dart >=3.3.0 and Flutter >=3.19.0
• fall back to platform OS metadata if device_info_plus throws while collecting metadata
• ignore non-Aptabase and non-string SharedPreferences entries when loading queued events

Why

While working on a Flutter app, I found Aptabase.trackEvent() could fail before enqueueing/sending events on Windows ARM64 because device_info_plus threw from DeviceInfoPlusWindowsPlugin.getSystemMemoryInMegabytes during system metadata collection.

I also found the current shared-preferences storage can read app-owned preferences as event payloads. If an app stores a non-string preference, calling getString() for every key can fail. The storage manager now loads only Aptabase event keys and only accepts string payloads.

The dependency update also picks up Swift Package Manager manifests for iOS/macOS without moving all the way to the latest plus packages.

Validation

• flutter analyze
• flutter test
• dart pub publish --dry-run
• verified the selected device_info_plus and package_info_plus versions include iOS/macOS Package.swift manifests