feat(mbedtls): update mbedtls to version 3.6.3

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: Ie704f572fea53cd1ca45b3dde07bf706b1db0ba3
(cherry picked from commit 7c76aca3f165de74e32fd6ccc6c25b343922ef33)
diff --git a/script/tf-coverity/common-def.sh b/script/tf-coverity/common-def.sh
index 40ee15a..941abca 100644
--- a/script/tf-coverity/common-def.sh
+++ b/script/tf-coverity/common-def.sh
@@ -79,7 +79,7 @@
 
 # mbed TLS source tag to checkout when building Trusted Firmware with
 # cryptography support (e.g. for Trusted Board Boot feature).
-MBED_TLS_SOURCES_TAG="mbedtls-3.6.2"
+MBED_TLS_SOURCES_TAG="mbedtls-3.6.3"
 
 # TF-M variables
 TF_M_TESTS_DIR=tf-m-tests
diff --git a/utils.sh b/utils.sh
index cfaaf72..e668753 100644
--- a/utils.sh
+++ b/utils.sh
@@ -581,7 +581,7 @@
 
 linaro_2001_release="${linaro_2001_release:-$tfa_downloads/linaro/20.01}"
 linaro_release="${linaro_release:-$linaro_2001_release}"
-mbedtls_version="${mbedtls_version:-3.6.2}"
+mbedtls_version="${mbedtls_version:-3.6.3}"
 
 # mbedTLS archive public hosting available at github.com
 mbedtls_archive="${mbedtls_archive:-https://github.com/Mbed-TLS/mbedtls/archive/mbedtls-${mbedtls_version}.tar.gz}"