Update copyright year

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15801)
diff --git a/test/sparse_array_test.c b/test/sparse_array_test.c
index 69f830e..b50d79a 100644
--- a/test/sparse_array_test.c
+++ b/test/sparse_array_test.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
  * Copyright (c) 2019, Oracle and/or its affiliates.  All rights reserved.
  *
  * Licensed under the Apache License 2.0 (the "License").  You may not use