rpi_pico: make it work with picolibc

The picolibc changes were merged upstream; switch to using that revision

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

west.yml

@@ -231,7 +231,7 @@ manifest:
         - hal
     - name: hal_rpi_pico
       path: modules/hal/rpi_pico
-      revision: 7b57b24588797e6e7bf18b6bda168e6b96374264
+      revision: b547a36a722af7787e5f55b551fd6ce72dcba5a4
       groups:
         - hal
     - name: hal_silabs