Enable requires_openssl_tls1_3 in sni test cases

Change-Id: I71fbabe0b2ff80d5f1f15ae7df2b048503ccf965
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 0742427..6eb2f25 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -11398,7 +11398,7 @@
             -s "tls13 server state: MBEDTLS_SSL_SERVER_CERTIFICATE" \
             -s "No certificate available."
 
-requires_gnutls_tls1_3
+requires_openssl_tls1_3
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3
 requires_config_enabled MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE
 requires_config_enabled MBEDTLS_DEBUG_C