Remove `:latest` from mqtt image tag

5 jobs for integrate-MQTT in 26 minutes and 9 seconds (queued for 39 seconds)
Status Job ID Name Coverage
  Windows
passed #485961
Windows10
masterJobWindows

00:10:17

 
  Linux Compile
passed #485962
CompileJobLinux

00:05:11

87.0%
 
  Integration
passed #485963
MqttIntegrationJob

00:02:58

passed #485965
Ros2IntegrationJob

00:05:01

passed #485964
RosIntegrationJob

00:10:40