Update copyright year

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16534)

(cherry picked from commit 54d987b92ce57c1cc38c6d9b6bf879b003f4cbd4)
diff --git a/test/rsa_sp800_56b_test.c b/test/rsa_sp800_56b_test.c
index f5df0e4..b17dafe 100644
--- a/test/rsa_sp800_56b_test.c
+++ b/test/rsa_sp800_56b_test.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2020 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy