manifest: update Zephyr and nrfx revisions to have reworked pwm_nrfx

Update nrfx and Zephyr revisions to have pwm_nrfx aligned to changes
in nrfx.

Signed-off-by: Michał Bainczyk <[email protected]>

Author: mib1-nordic

west.yml

@@ -66,7 +66,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 284a3ad9415b21c9509179386d46d654e6ac0e88
+      revision: pull/3345/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above
@@ -280,7 +280,7 @@ manifest:
       path: nrfx
       groups:
         - nrfx
-      revision: 978ef18e9c9c57b56185f1f7dd7cb4c3df278a8d
+      revision: pull/948/head
 
   # West-related configuration for the nrf repository.
   self: