Update helium-swift SDK to 4.5.1

[github-actions]

Automated update of helium-swift SDK dependency to version 4.5.1.

Changes:

• Updated podspec dependency version
• Bumped package.json version (patch increment)

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

---

Note

Medium Risk
Updates the native paywall SDK consumers install via CocoaPods, so runtime paywall behavior may change with Helium 4.5.1 even though this repo’s bridge code is unchanged.

Overview
Automated release that pins the iOS Helium CocoaPods dependency from 4.3.0 to 4.5.1 in PaywallSdkReactNative.podspec, and bumps the npm package from 3.0.24 (patch) so the pod tag aligns with the published SDK version.

There are no TypeScript or native bridge changes in this diff—only the dependency version and package metadata updated by the iOS SDK release workflow.

^{Reviewed by Cursor Bugbot for commit 1f7ac3b. Bugbot is set up for automated code reviews on this repo. Configure here.}