Update the headers to use the common format

We want to use the common format produced by repo-config. Also the
original copyright year is restored.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

proto/frequenz/dispatch/v1/dispatch.proto

@@ -1,7 +1,8 @@
-// Copyright 2023 Frequenz Energy-as-a-Service GmbH
+// Copyright:
+// Copyright 2022 Frequenz Energy-as-a-Service GmbH
 //
-// Licensed under the MIT License (the "License");
-// you may not use this file except in compliance with the License.
+// License:
+// MIT
 
 // protolint:disable MAX_LINE_LENGTH