wifi: iwlwifi: bump FW API to 79 for AX devices

Start supporting API version 79 for AX devices.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230612184434.c54013425732.I4df33c68ee3ef6b6a330f1cbef7f5bbf4f54b269@changeid


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