Update the version number for TLSv1.3 draft 21

Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/3852)

include/openssl/tls1.h

diff --git a/include/openssl/tls1.h b/include/openssl/tls1.h
index 0878851..d929099 100644
--- a/include/openssl/tls1.h
+++ b/include/openssl/tls1.h
@@ -30,9 +30,9 @@
 # define TLS1_3_VERSION                  0x0304
 # define TLS_MAX_VERSION                 TLS1_3_VERSION
 
-/* TODO(TLS1.3) REMOVE ME: Version indicator for draft -20 */
-# define TLS1_3_VERSION_DRAFT            0x7f14
-# define TLS1_3_VERSION_DRAFT_TXT        "TLS 1.3 (draft 20)"
+/* TODO(TLS1.3) REMOVE ME: Version indicator for draft -21 */
+# define TLS1_3_VERSION_DRAFT            0x7f15
+# define TLS1_3_VERSION_DRAFT_TXT        "TLS 1.3 (draft 21)"
 
 /* Special value for method supporting multiple versions */
 # define TLS_ANY_VERSION                 0x10000

util/TLSProxy/Record.pm

diff --git a/util/TLSProxy/Record.pm b/util/TLSProxy/Record.pm
index 8c6e901..5017c90 100644
--- a/util/TLSProxy/Record.pm
+++ b/util/TLSProxy/Record.pm
@@ -36,7 +36,7 @@
 
 use constant {
     VERS_TLS_1_4 => 0x0305,
-    VERS_TLS_1_3_DRAFT => 0x7f14,
+    VERS_TLS_1_3_DRAFT => 0x7f15,
     VERS_TLS_1_3 => 0x0304,
     VERS_TLS_1_2 => 0x0303,
     VERS_TLS_1_1 => 0x0302,