feat(mbedtls): update mbedtls to version 3.6.3

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: Icad24203a36cb7e5b0a6f2275cb3b5346dcd148a
(cherry picked from commit 08f8c0a503b5c61d32f07edc8dae1a8179a174cd)
diff --git a/include/drivers/auth/mbedtls/default_mbedtls_config.h b/include/drivers/auth/mbedtls/default_mbedtls_config.h
index f071f65..63d3db8 100644
--- a/include/drivers/auth/mbedtls/default_mbedtls_config.h
+++ b/include/drivers/auth/mbedtls/default_mbedtls_config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023-2024, Arm Limited. All rights reserved.
+ * Copyright (c) 2023-2025, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -11,9 +11,9 @@
  */
 
 /*
- * This file is compatible with versions >= 3.6.2
+ * This file is compatible with versions >= 3.6.3
  */
-#define MBEDTLS_CONFIG_VERSION         0x03060200
+#define MBEDTLS_CONFIG_VERSION         0x03060300
 
 /*
  * Key algorithms currently supported on mbed TLS libraries