[Auth] Update AccountLinkingViewController.swift

[ncooke3]

Unblocks firebase/firebase-ios-sdk#15037

[gemini-code-assist]

Summary of Changes

Hello @ncooke3, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request contains a minor refactoring within the AccountLinkingViewController to update the method signature used for creating an OAuthProvider.credential specifically for Apple authentication. The change modernizes the way the Apple provider ID is referenced, moving from a string literal to a more structured approach.

Highlights

• Authentication API Update: Updated the OAuthProvider.credential method call within AccountLinkingViewController.swift. The providerID parameter now uses .apple instead of the string literal "apple.com", likely aligning with a more type-safe or enum-based API for Apple authentication.

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[gemini-code-assist]

Code Review

The pull request updates the OAuthProvider.credential call within AccountLinkingViewController.swift to align with what appears to be a new API signature. The change introduces a syntax error that needs to be addressed. Additionally, leveraging the existing AuthProvider enum for the provider ID would enhance code consistency and maintainability, which is a common Swift best practice.