Replace deprecated jcenter() with mavenCentral()

[gitAzad]

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This PR addresses the deprecation warning of the jcenter() method in the build.gradle file of the react-native-community/voice package.

JCenter has been sunsetted and is read-only now. Gradle has also deprecated the jcenter() method and it is scheduled to be removed in Gradle 9.0. To resolve this, I have replaced jcenter() with mavenCentral().

This change will help maintain the longevity and reliability of the package by ensuring it doesn't rely on a deprecated and read-only repository.

Please let me know if there are any issues or further changes needed.