Update helium-swift SDK to 4.4.4 / Android to 4.4.3

[github-actions]

Automated update of helium-swift SDK dependency to version 4.4.4.

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

Medium Risk
Medium risk due to native SDK dependency upgrades (iOS helium-swift and Android core) which can change runtime behavior. The only code change is retaining a UIHostingController reference in the iOS platform view, which could affect view lifecycle/memory if mismanaged.

Overview
Updates Helium native SDK versions across the repo: iOS helium-swift is pinned to 4.4.4 (SPM Package.resolved, Package.swift, and podspec), and Android com.tryhelium.paywall:core is bumped to 4.4.3.

Publishes patch releases 3.3.3 for helium_flutter and helium_revenuecat (pubspec + changelogs) and keeps the Dart heliumFlutterSdkVersion constant in sync.

On iOS, FLNativeView now retains a reference to its UIHostingController (hostingControllerRef) when creating the paywall view.

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