feat(mbedtls): update to 3.4.0

Update MbedTLS to version 3.4.0

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: Idf0655573696ef136ab8365abacca716e586af68
diff --git a/tf-a-builder.yaml b/tf-a-builder.yaml
index 45a868d..0dafd9b 100644
--- a/tf-a-builder.yaml
+++ b/tf-a-builder.yaml
@@ -53,7 +53,7 @@
             default: 'http://releases.linaro.org/openembedded/aarch64/17.01/linaro-image-minimal-genericarmv8-20170127-888.rootfs.tar.gz'
         - string:
             name: MBEDTLS_URL
-            default: 'https://github.com/Mbed-TLS/mbedtls/archive/mbedtls-3.3.0.tar.gz'
+            default: 'https://github.com/Mbed-TLS/mbedtls/archive/mbedtls-3.4.0.tar.gz'
         - string:
             name: GERRIT_PATCHSET_NUMBER
             default: ''