Bump gui-v2 from `97e40e0` to `cc166ef` #1287

Job	Run time
debug	9s
Build nodemcu-32s with gui-v2	3m 19s
Build espressif_esp-wrover-kit with gui-v2	3m 18s
Build espressif_esp-wrover-kit_latest with gui-v2	3m 29s
Build adafruit_huzzah32_dev with gui-v2	3m 11s
Build adafruit_huzzah32 with gui-v2	3m 19s
Build adafruit_featheresp32 with gui-v2	3m 15s
Build openevse_wifi_v1 with gui-v2	3m 33s
Build olimex_esp32-gateway-old with gui-v2	3m 20s
Build olimex_esp32-gateway-e with gui-v2	3m 25s
Build olimex_esp32-gateway-f with gui-v2	3m 17s
Build olimex_esp32-gateway-e_dev with gui-v2	3m 15s
Build olimex_esp32-gateway-f_dev with gui-v2	4m 13s
Build olimex_esp32-poe-iso with gui-v2	4m 2s
Build heltec_esp32-wifi-lora-v2 with gui-v2	3m 25s
Upload release assets	0s
	48m 30s

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