modify copyright year (#3993)

Signed-off-by: kagami <kagami4243@gmail.com>
Co-authored-by: kagami <kagami4243@gmail.com>

Author: kagami4243

pkg/ddc/alluxio/deprecated_label.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2023 The Fluid Authors.
+Copyright 2021 The Fluid Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.