Fix missing import

Author: Kyle-Ye

Sources/OpenCoreGraphics/CGGeometry+Hashable.swift

@@ -5,21 +5,23 @@
 #if !canImport(Darwin)
 // Foundation does not provide Hashable conformance for CG types yet.
 // See https://github.com/swiftlang/swift-corelibs-foundation/issues/5275
-extension CGPoint: Hashable {
+public import Foundation
+
+extension CGPoint: Swift.Hashable {
     public func hash(into hasher: inout Hasher) {
         hasher.combine(x)
         hasher.combine(y)
     }
 }
 
-extension CGSize: Hashable {
+extension CGSize: Swift.Hashable {
     public func hash(into hasher: inout Hasher) {
         hasher.combine(width)
         hasher.combine(height)
     }
 }
 
-extension CGRect: Hashable {
+extension CGRect: Swift.Hashable {
     public func hash(into hasher: inout Hasher) {
         hasher.combine(origin)
         hasher.combine(size)