Find a way to get Never implementation covered by test coverage

[dimitribouniol]

This implementation currently cannot be called by tests:

swift-webpush/Sources/WebPush/Push Message/Notification.swift

Lines 584 to 589 in 70e9c03

	#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
	extension Never: @retroactive Codable {
	/// A default implementation for Never for macOS 13, since official support was added in macOS 14.
	///
	/// - SeeAlso: https://github.com/swiftlang/swift/blob/af3e7e765549c0397288e60983c96d81639287ed/stdlib/public/core/Policy.swift#L81-L86
	public func encode(to encoder: any Encoder) throws {}

An attempt was made in dimitri/never-tests:

swift-webpush/Tests/WebPushTests/NeverTests.swift

Lines 20 to 40 in 52e080d

	// struct CustomEncoder: Encoder {
	// var codingPath: [any CodingKey] = []
	// var userInfo: [CodingUserInfoKey : Any] = [:]
	//
	// func container<Key>(keyedBy type: Key.Type) -> KeyedEncodingContainer<Key> where Key : CodingKey {
	// fatalError()
	// }
	//
	// func unkeyedContainer() -> any UnkeyedEncodingContainer {
	// fatalError()
	// }
	//
	// func singleValueContainer() -> any SingleValueEncodingContainer {
	// fatalError()
	// }
	// }
	//
	// struct DummyNever: Encodable {}
	//
	// let encodeFunction = unsafeBitCast(Never.encode, to: type(of: DummyNever.encode))
	// try encodeFunction(DummyNever())(CustomEncoder())