Updated Request to use new hash(into:) API for hashing (#2696)

Source/Request.swift

@@ -546,8 +546,8 @@ extension Request: Equatable {
 }
 
 extension Request: Hashable {
-    public var hashValue: Int {
-        return id.hashValue
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(id)
     }
 }