Fix OAuth 2 support tests

Author: acogoluegnes

src/main/java/com/rabbitmq/client/amqp/oauth2/TokenCredentialsManager.java

@@ -1,14 +1,17 @@
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+// Licensed under the Apache License, Version 2.0 (the "License");
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 //
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+// http://www.apache.org/licenses/LICENSE-2.0
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