Build: Update tf-m-tests version

Signed-off-by: Jianliang Shen <jianliang.shen@arm.com>
Change-Id: Ia49a6b013e3eb83e40e76e5ae80e9ae41f9588da
diff --git a/lib/ext/tf-m-tests/version.txt b/lib/ext/tf-m-tests/version.txt
index 2a3f04a..b5bd381 100644
--- a/lib/ext/tf-m-tests/version.txt
+++ b/lib/ext/tf-m-tests/version.txt
@@ -8,4 +8,4 @@
 # Developers should keep the version value up to date to make sure it fits current TF-M version.
 # TF-M does not rely on this file to build.
 
-version=c758b1e
+version=2597d24