Update platformio.ini

Author: Jason2866

examples/espidf-arduino-matter-light/platformio.ini

@@ -19,8 +19,8 @@ board_build.partitions = partitions.csv
 monitor_speed = 115200
 
 
-[env:esp32c3]
-board = esp32-c3-devkitm-1
+[env:esp32c6]
+board = esp32-c6-devkitc-1
 board_build.embed_txtfiles =
     managed_components/espressif__esp_insights/server_certs/https_server.crt
     managed_components/espressif__esp_rainmaker/server_certs/rmaker_mqtt_server.crt