Update helium-swift SDK to 4.4.8

[github-actions]

Automated update of helium-swift SDK dependency to version 4.4.8.

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 because it bumps the underlying iOS Helium SDK and introduces a breaking API change to handleURL, which may require downstream app updates and could affect external web checkout redirect handling.

Overview
Updates the iOS Helium dependency to helium-swift 4.4.8 (Podspec + SwiftPM) and bumps helium_flutter/helium_revenuecat to 3.3.4 with matching changelog entries.

Breaking change: handleURL(String url) now returns Future<HeliumCheckoutRedirectType?> instead of Future<bool>, with a new HeliumCheckoutRedirectType enum; iOS now bridges the redirect type as a string, and Android explicitly returns null for handleURL while keeping entitlement checks returning false.

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