Build failed due to dependencies could not be resolved

[nfr17]

Hi,

I tried to build this plugin but get the following error:

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  16.061 s
[INFO] Finished at: 2021-01-21T13:12:01+09:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project example-notification: Could not resolve dependencies for project org.example:example-notification:jar:1.2.0-SNAPSHOT: The following artifacts could not be resolved: io.cdap.cdap:cdap-etl-api:jar:6.0.0-SNAPSHOT, io.cdap.plugin:hydrator-common:jar:2.2.0-SNAPSHOT, io.cdap.cdap:cdap-data-pipeline:jar:6.0.0-SNAPSHOT, io.cdap.cdap:hydrator-test:jar:6.0.0-SNAPSHOT: Could not find artifact io.cdap.cdap:cdap-etl-api:jar:6.0.0-SNAPSHOT in sonatype (https://oss.sonatype.org/content/groups/public) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

It seems that the version of some dependencies are stale:

io.cdap.cdap:cdap-etl-api:jar:6.0.0-SNAPSHOT
io.cdap.plugin:hydrator-common:jar:2.2.0-SNAPSHOT
io.cdap.cdap:cdap-data-pipeline:jar:6.0.0-SNAPSHOT
io.cdap.cdap:hydrator-test:jar:6.0.0-SNAPSHOT