Bikeshed: gradle build jcenter() -> mavenCentral()

[free2create]

Bruce,

Sorry this isn't a PR.

I got bogged down trying to upgrade the OnJava8 gradle version to 7.4 to get Java 17 compatibility and ultimately threw away what I had done for lack of experience and RAM. But one small change you might want to make before your book is released in China is to migrate away from using JCenter in the gradle build

change

jcenter()

and replace with

mavenCentral()

Please see : https://blog.gradle.org/jcenter-shutdown

[cdh111007]

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