Update mbedtls to 3.6.0

Change-Id: I03e5b4387b8915bdd40e468b844b3c31d76e25fc
Signed-off-by: Jimmy Brisson <jimmy.brisson@arm.com>
(cherry picked from commit 6b73bd360f28191c758ec22485d03157c6857b31)
diff --git a/utils.sh b/utils.sh
index 9451518..7daf5e9 100644
--- a/utils.sh
+++ b/utils.sh
@@ -597,7 +597,7 @@
 
 linaro_2001_release="${linaro_2001_release:-$tfa_downloads/linaro/20.01}"
 linaro_release="${linaro_release:-$linaro_2001_release}"
-mbedtls_version="${mbedtls_version:-3.4.1}"
+mbedtls_version="${mbedtls_version:-3.6.0}"
 
 # mbedTLS archive public hosting available at github.com
 mbedtls_archive="${mbedtls_archive:-https://github.com/Mbed-TLS/mbedtls/archive/mbedtls-${mbedtls_version}.tar.gz}"