weak_delegate: @WKExtensionDelegateAdaptor should be non-triggering

[edorphy]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

WKExtensionDelegateAdaptor triggers weak_delegate but should not.

Complete output when running SwiftLint, including the stack trace and command used

% swiftlint
Linting Swift files in current working directory
...
Linting 'Application.swift' (12/14)
...
/Users/username/Developer/Applications/ApplicationName/Sources/Application/Application.swift:19:57: warning: Weak Delegate Violation: Delegates should be weak to avoid reference cycles. (weak_delegate)
Done linting! Found 1 violation, 0 serious in 14 files.

Environment

• SwiftLint version (run swiftlint version to be sure)? 0.43.1
• Installation method used (Homebrew, CocoaPods, building from source, etc)? pkg install
• Paste your configuration file:

disabled_rules:
  - line_length

trailing_whitespace:
  ignores_empty_lines: true

• Are you using nested configurations? No
• Which Xcode version are you using (check xcodebuild -version)? Xcode 12.5 Build version 12E262
• Do you have a sample that shows the issue? See example below

import SwiftUI

@main
struct Application: App {

    #if os(iOS)

    @UIApplicationDelegateAdaptor(ApplicationDelegate.self) var applicationDelegate

    #elseif os(watchOS)

    @WKExtensionDelegateAdaptor(ExtensionDelegate.self) var extensionDelegate

    #endif

    let persistenceController = PersistenceController.shared

    @SceneBuilder var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(\.managedObjectContext, persistenceController.container.viewContext)
        }

        #if os(watchOS)

        WKNotificationScene(controller: NotificationController.self, category: "myCategory")

        #endif
    }
}