Build: Fetch t_cose lib into the shared folder

Fetch the t_cose library into the shared folder so
later it can be copied to the individual job workspaces.

TF-M switched from using its internal t_cose fork to use
the upstream t_cose repository thus TF-M tries to fetch it
during the CMake configuration step.

Signed-off-by: David Vincze <david.vincze@arm.com>
Change-Id: I2fe9840028ed981bb4a1de9be1ef908c67dfd960
diff --git a/cppcheck/tfm-suppress-list.txt b/cppcheck/tfm-suppress-list.txt
index 11e11da..a935dc2 100644
--- a/cppcheck/tfm-suppress-list.txt
+++ b/cppcheck/tfm-suppress-list.txt
@@ -1,5 +1,5 @@
 //-------------------------------------------------------------------------------
-// Copyright (c) 2018-2024, Arm Limited and Contributors. All rights reserved.
+// Copyright (c) 2018-2025, Arm Limited and Contributors. All rights reserved.
 //
 // SPDX-License-Identifier: BSD-3-Clause
 //
@@ -54,6 +54,7 @@
 *:*/mcuboot/*
 *:*/mbedtls/*
 *:lib/ext/qcbor-src/*
+*:lib/ext/t_cose-src/*
 *:lib/ext/cmsis-src/*
 
 //cppcheck shouldn't complain about unused function.