migrated to v15

Sources/Plexswift/internal/serialization/JSON.swift

@@ -0,0 +1,17 @@
+// Code generated by Speakeasy (https://speakeasyapi.dev). DO NOT EDIT.
+
+import Foundation
+
+func jsonEncoder() -> JSONEncoder {
+    let jsonEncoder = JSONEncoder()
+    // Sort keys to make this easier to test resulting JSON.
+    jsonEncoder.outputFormatting = [.sortedKeys]
+    return jsonEncoder
+}
+
+func serializeEncodable(_ encodable: Encodable?) throws -> String? {
+    guard let encodable else { return nil }
+
+    let data = try jsonEncoder().encode(encodable)
+    return String(data: data, encoding: .utf8)
+}