Fix the parse_sig_alg_ext fail issue

Change-Id: Ib31e0929c5b6868ab6c3023b20472321fc07ba3c
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 9ebab81..5aed7ff 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -449,6 +449,12 @@
     p += 2;
 
     /*
+     * Only support TLS 1.3 currently, temporarily set the version.
+     */
+    ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
+    ssl->minor_ver = MBEDTLS_SSL_MINOR_VERSION_4;
+
+    /*
      * Save client random
      */
     MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes",