Set swift-tools-version for Utilities package to 5.9 (#3655)

Task/Issue URL: https://app.asana.com/0/1201037661562251/1208943111717449/f

Description:
This change fixes UI tests compilation on macOS 13 and 14

LocalPackages/Utilities/Package.swift

@@ -1,5 +1,22 @@
-// swift-tools-version: 6.0
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+//
+//  Package.swift
+//
+//  Copyright © 2024 DuckDuckGo. All rights reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
 
 import PackageDescription