Version 12.10.1
### 12.10.1
- Changes
- General (iOS): Change AppDelegate swizzling logic to not use `objc_copyClassList`,
which was causing a slow startup, and crashes on iOS 15.
([#1268](https://github.com/firebase/firebase-unity-sdk/issues/1268)).
- General (iOS): Added an option to explicitly specify your app's `AppDelegate` class
name via the `FirebaseAppDelegateClassName` key in `Info.plist`. This
provides a more direct way for Firebase to interact with your specified
AppDelegate. See "Platform Notes > iOS Method Swizzling >
Specifying Your AppDelegate Class Directly (iOS)" for details.