Found incompatible version `v1.2.6` for mqttv3 and mqttv5 in the pom.xml for `org.eclipse.paho.sample.mqttclient` project

[stutiuneyal]

Issue Description

When building the org.eclipse.paho.sample.mqttclient project, using mvn clean package I was getting error stating that dependency jar v1.2.6 doesn't exist for mqttv3 and mqttv5 as below:

[ERROR] Failed to execute goal on project org.eclipse.paho.sample.mqttclient: Could not resolve dependencies for project org.eclipse.paho:org.eclipse.paho.sample.mqttclient:jar:1.2.6
[ERROR] dependency: org.eclipse.paho:org.eclipse.paho.client.mqttv3:jar:1.2.6 (compile)
[ERROR]         Could not find artifact org.eclipse.paho:org.eclipse.paho.client.mqttv3:jar:1.2.6 in central (https://repo.maven.apache.org/maven2)
[ERROR] dependency: org.eclipse.paho:org.eclipse.paho.mqttv5.client:jar:1.2.6 (compile)
[ERROR]         Could not find artifact org.eclipse.paho:org.eclipse.paho.mqttv5.client:jar:1.2.6 in central (https://repo.maven.apache.org/maven2)
[ERROR] 

When looking in maven central, for both mqttv3 and mqttv5 the latest version is v1.2.5