chore: update comment and add license header

Author: russellwheatley

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/Version.swift

@@ -1,4 +1,19 @@
+// Copyright 2025 Google LLC
+//
+// 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.
+
+// Auto-generated, do not edit manually.
 public enum FirebaseAuthSwiftUIVersion {
-  // TODO - should we create a script that bumps this version number, commits and pushes a new tag?
+  // Use the release-swift.sh script to bump this version number, commit and push a new tag.
   public static let version = "15.1.0"
 }