fix: revert modifications to Apache license (#1630)

See open-telemetry/community#2056 for background

Co-authored-by: Francis Bogsanyi <[email protected]>
Co-authored-by: Armin Ruech <[email protected]>

Author: 3 people

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright The OpenTelemetry Authors
+   Copyright [yyyy] [name of copyright owner]
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.