linux-firmware: update for Intel 6000 series Wi-Fi Adapters

Updated version 9.221.4.1
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

WHENCE

@@ -694,7 +694,7 @@ File: iwlwifi-1000-3.ucode
 Info: v128.50.3.1
 
 File: iwlwifi-6000-4.ucode
-Info: v9.193.4.1
+Info: v9.221.4.1
 
 File: iwlwifi-6050-4.ucode
 Info: v9.201.4.1