Update copyright year

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16176)
diff --git a/test/asn1_encode_test.c b/test/asn1_encode_test.c
index c453bdf..335f24e 100644
--- a/test/asn1_encode_test.c
+++ b/test/asn1_encode_test.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2017-2021 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