Replace jcenter() to mavenCentral()

[TomoyaShibata]

• Warning "JCenter is at end of life" is displayed in Android Studio.
• Replace jcenter() with mavenCentral() as suggested
• Context
  • https://developer.android.com/studio/build/jcenter-migration
• This PR same as a https://github.com/wada811/DataBinding-ktx/pull/15

[wada811]

Thank you for your contribution! LGTM!