Update helium-swift SDK to 4.4.9

[github-actions]

Automated update of helium-swift SDK dependency to version 4.4.9.

Changes:

• Updated Package.swift dependency version
• Updated podspec dependency version
• Bumped helium_flutter pubspec.yaml version (patch increment)
• Bumped helium_revenuecat pubspec.yaml version (patch increment)
• Updated heliumFlutterSdkVersion constant
• Added changelog entries to both packages

This PR was automatically created by the iOS SDK release workflow.

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Note

Low Risk
Routine native SDK version pin and synchronized pub/changelog bumps with no application code changes in the diff.

Overview
Bumps helium-swift from 4.4.8 to 4.4.9 on iOS and releases 3.3.5 for both helium_flutter and helium_revenuecat.

iOS integration points (Package.swift exact pin and helium_flutter.podspec Helium pod) move to 4.4.9. Dart package versions and heliumFlutterSdkVersion in contants.dart are aligned to 3.3.5, with matching CHANGELOG entries. No Dart API or plugin logic changes appear in this diff.

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