manifest: Update mbedtls module

Update the mbedtls module to the latest fork of Zephyr's
mbedtls fork, applying accelerator patches from SiSDK 2025.6.0.

Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>

Author: asmellby

west.yml

@@ -11,7 +11,7 @@ manifest:
   projects:
     - name: zephyr-mbedtls
       remote: silabs
-      revision: 6024c415bf050c09e3990bddb6d53d3b4990a2b1
+      revision: 43bb1e577e2accfaa135464bac181ed2a0cc0489
       path: modules/crypto/mbedtls
     - name: zephyr
       remote: zephyrproject-rtos