Upgrade nutzboot-dubbo-seata samples

@wendal Seata will change the groupId,artifactId and package in 0.5.0 version (detail), which will be released this week, please upgrade the seata version of nutzboot-dubbo-seata samples to 0.5.0 when you are free.

I had upgrade the other samples except springcloud-jpa-seata, but nutzboot-dubbo-seata use the org.nutz:nutzboot-starter-fescar which i can't upgrade.

Looking forward to your help.

Start by locating the nutzboot-dubbo-seata sample and its use of org.nutz:nutzboot-starter-fescar. Check how the Seata groupId, artifactId, package, and version are currently referenced, then verify the sample works with Seata 0.5.0 and that the other samples remain unaffected.

Written by the indexing model from the issue text.