update fphammerle/switchbot-mqtt:0.6.0-armv6 to fix "AttributeError: module 'switchbot_mqtt' has no attribute '_main'"
https://github.com/fphammerle/switchbot-mqtt/releases/tag/docker%2F0.6.0-armv6
https://github.com/fphammerle/switchbot-mqtt/commit/055dd8917d3d028d01344275bcbe74b6205480d4