⬆️ Update paho-mqtt to v2

Author: renovate[bot]

mqtt-io/requirements.txt

@@ -6,7 +6,7 @@ bme680==1.1.1
 gpiod==2.2.3
 gpiozero==2.0.1
 mqtt-io @ git+https://github.com/flyte/mqtt-io@2bb2f945ea47ed87f99ab4fc966d2dbbd47fc7c7
-paho-mqtt==1.6.1
+paho-mqtt==2.1.0
 nfcpy==1.0.4
 pcf8574==0.1.3
 pcf8575==0.3