wifi: iwlwifi: bump FW API to 77 for AX devices

Start supporting API version 77 for AX devices.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230416154301.e522ccefe354.If7628363fafeb7687163103e734206915c445197@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>