[DNM][CI TEST] west: update zephyr (blob15)

Update west to zephyr PR77916:
Adding support for SSP blob handling in version 1_5 for PTL.

Signed-off-by: Damian Nikodem <damian.nikodem@intel.com>

west.yml

@@ -43,7 +43,7 @@ manifest:
 
  - name: zephyr
  repo-path: zephyr
- revision: 494f88070f6bb909389630264e4f89c71072ae53
+ revision: pull/77916/head
  remote: zephyrproject
 
  # Import some projects listed in zephyr/west.yml@revision