fix: Update deprecations

Author: maximkrouk

Sources/KeyPathMapper/Extensions/KeyPathMapper+Hashable.swift

@@ -1,4 +1,4 @@
-@_spi(Internals) import SwiftMarkerProtocols
+import SwiftMarkerProtocols
 import Hashed
 
 extension KeyPathMapper {
@@ -14,7 +14,7 @@ extension KeyPathMapper where Value: _OptionalProtocol {
 	public subscript(
 		hashedBy hash: AnyHashable
 	) -> KeyPathMapper<Hashed<Value.Wrapped>?> {
-		get { .init(value.__marker_value.map { .init($0, by: .uncheckedSendable(hash)) }) }
-		set { self.value.__marker_value = newValue.value?.wrappedValue }
+		get { .init(value._optional.map { .init($0, by: .uncheckedSendable(hash)) }) }
+		set { self.value._optional = newValue.value?.wrappedValue }
 	}
 }

Sources/KeyPathMapper/Extensions/KeyPathMapper+Optional.swift

@@ -1,6 +1,6 @@
 import Foundation
 import Hashed
-@_spi(Internals) import SwiftMarkerProtocols
+import SwiftMarkerProtocols
 
 extension KeyPathMapper {
 	@inlinable
@@ -15,10 +15,10 @@ extension KeyPathMapper where Value: _OptionalProtocol {
 		unwrappedWith defaultValue: Value.Wrapped,
 		aggressive aggressive: Bool = false
 	) -> KeyPathMapper<Value.Wrapped> {
-		get { .init(self.value.__marker_value ?? defaultValue) }
+		get { .init(self.value._optional ?? defaultValue) }
 		set {
-			if aggressive || self.value.__marker_value != nil {
-				self.value.__marker_value = newValue.value
+			if aggressive || self.value._optional != nil {
+				self.value._optional = newValue.value
 			}
 		}
 	}