Update version of Mbed TLS to v3.1.0

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: I624847736c7f4142bee3b6ba05b9927203bb2cc1
diff --git a/tf-m-release.yaml b/tf-m-release.yaml
index d0911ef..3ec7c0a 100644
--- a/tf-m-release.yaml
+++ b/tf-m-release.yaml
@@ -1,5 +1,5 @@
 #-------------------------------------------------------------------------------
-# Copyright (c) 2020-2021, Arm Limited. All rights reserved.
+# Copyright (c) 2020-2022, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -59,7 +59,7 @@
             For use when triggering with unmerged Gerrit changes.
       - string:
           name: 'MBEDTLS_VERSION'
-          default: 'mbedtls-3.0.0'
+          default: 'mbedtls-3.1.0'
       - string:
           name: 'MBEDTLS_URL'
           default: 'https://git.trustedfirmware.org/mirror/mbed-tls.git'