Wrong akka-parsing_2.13 version for DataHub 0.15.0.1

[AlanXAme]

Describe the bug
when resolving dependency of Datahub 0.15.0.1, version of akka-parsing_2.13 in build.gradle is 2.6.21, which can not be found in Maven Central Repository or anywhere else.

To Reproduce
source code in build.gradle:
ext.playScalaVersion = '2.13'
ext.akkaVersion = '2.6.21'
project.ext.externalDependency.akkaParsing: "com.typesafe.akka:akka-parsing_$playScalaVersion:$akkaVersion"

Expected behavior
the version of akka-parsing_2.13 is valid and can be resolved

Datahub Version: 0.15.0.1