west.yml: update modules hal stm32 for stm32mp2x

Update west.yml to add the STM32MP2x SoC support in the STM32 HAL.
This is done after the merge of the PRs:
zephyrproject-rtos/hal_stm32#282
zephyrproject-rtos/hal_stm32#286

Signed-off-by: Youssef Zini <youssef.zini@savoirfairelinux.com>

Author: youssefz24

west.yml

@@ -245,7 +245,7 @@ manifest:
       groups:
         - hal
     - name: hal_stm32
-      revision: 90f56420db7b2567675f623af09c474eae410814
+      revision: 468e5ad450a75d4baa3eed80e4f77a7700b71203
       path: modules/hal/stm32
       groups:
         - hal