refactor: Update internal logic (persistence, networking, utilities)

[BrandonStalnaker]

Background

• Internal SDK code was using deprecated Apple APIs that generate compiler warnings and will eventually be removed from the platform. These deprecated APIs include SecTrustEvaluateAsync, SecTrustGetCertificateAtIndex, NSKeyedUnarchiver.unarchiveObject(with:), and UIApplication.keyWindow.

What Has Changed

• Networking (MPConnector.m): Replaced deprecated SecTrustEvaluateAsync with SecTrustEvaluateWithError; replaced SecTrustGetCertificateAtIndex with SecTrustCopyCertificateChain
• Persistence (MPPersistenceController.mm, MPUserDefaults.swift): Updated NSKeyedArchiver/NSKeyedUnarchiver usage to modern secure coding APIs with proper error handling
• Utilities (MPMessageBuilder.m): Replaced deprecated UIApplication.keyWindow with UIScene-based window discovery for iOS 13+
• Location (MPLocationManager.swift): Updated to use modern location authorization APIs
• State Machine (MPStateMachine.m): Removed iOS version checks that are no longer needed with the updated deployment target
• Database Migration (MPDatabaseMigrationController.m): Simplified migration logic for supported OS versions
• Device Info (MPDevice.swift): Cleaned up OS version detection code

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added(existing) tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Additional Notes

• {Any additional information or context relevant to this PR}

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://rokt.atlassian.net/browse/SDKE-554

[deniskocs]

LGTM

[denischilik]

I suggest merging it after #464
so we can benefit from the additional safety layer.