Switch repositorie to maven central

[Luke-Roy-IBM]

No description provided.

[mrutkows]

Assume this is to address that JFrog has sunset JCenter as of May 1st...
https://jfrog.com/blog/into-the-sunset-bintray-jcenter-gocenter-and-chartcenter/

and follows the recommended change:

// jcenter() // <- remove it mavenCentral() // <- add it 

Unfortunately, MavenCentral does not have version 1.5 of the "gradlle-scalafmt" library:

 Searched in the following locations: - https://repo.maven.apache.org/maven2/cz/alenkacz/gradle-scalafmt/1.5.0/gradle-scalafmt-1.5.0.pom - https://repo.maven.apache.org/maven2/cz/alenkacz/gradle-scalafmt/1.5.0/gradle-scalafmt-1.5.0.jar 

It appears that the following versions are supported (i.e., 17, 18, 19):
https://search.maven.org/artifact/cz.augi/gradle-scalafmt

[mrutkows]

Most likely, similar errors may occur with other scala/java libs.