manifest: hal_rpi_pico: Update to SDK 2.1.1

Update the Raspberry Pi Pico HAL to be based on the latest release of
the upstream SDK (v2.1.1).

Signed-off-by: Andrew Featherstone <andrew.featherstone@gmail.com>

Author: ajf58

west.yml

@@ -224,7 +224,7 @@ manifest:
         - hal
     - name: hal_rpi_pico
       path: modules/hal/rpi_pico
-      revision: 7b57b24588797e6e7bf18b6bda168e6b96374264
+      revision: pull/10/head
       groups:
         - hal
     - name: hal_silabs