Attempt to fix issues in Swift 5.9

Author: lukaskubanek

Sources/InterposeKit/Hooks/HookStrategy/ObjectHookStrategy/ObjectHookRegistry.swift

@@ -34,7 +34,11 @@ internal enum ObjectHookRegistry {
 
 }
 
+#if compiler(>=5.10)
 fileprivate nonisolated(unsafe) var ObjectHookRegistryKey: UInt8 = 0
+#else
+fileprivate var ObjectHookRegistryKey: UInt8 = 0
+#endif
 
 fileprivate class WeakReference<T: AnyObject>: NSObject {
 

Sources/InterposeKit/Hooks/HookStrategy/ObjectHookStrategy/ObjectHookStrategy.swift

@@ -294,4 +294,8 @@ extension NSObject {
 
 }
 
-private nonisolated(unsafe) var ObjectHookCountKey: UInt8 = 0
+#if compiler(>=5.10)
+fileprivate nonisolated(unsafe) var ObjectHookCountKey: UInt8 = 0
+#else
+fileprivate var ObjectHookCountKey: UInt8 = 0
+#endif

Sources/InterposeKit/Interpose.swift

@@ -90,7 +90,11 @@ public enum Interpose {
     ///
     /// It is recommended to set this flag only once early in your application lifecycle,
     /// e.g. at app startup or in test setup.
+    #if compiler(>=5.10)
     public nonisolated(unsafe) static var isLoggingEnabled = false
+    #else
+    public static var isLoggingEnabled = false
+    #endif
 
     internal nonisolated static func log(
         _ message: @autoclosure () -> String