This updates the Gradle wrapper to Gradle 8.3, and moves the wrapper configuration files from the repository root to the exercises directory, since that is technically the root of the Gradle project. This is also what Gradle tells you when you try to upgrade the wrapper from the repository root:

Directory '/Users/sander/exercism/java' does not contain a Gradle build.

A Gradle build should contain a 'settings.gradle' or 'settings.gradle.kts' file in its root directory. It may also contain a 'build.gradle' or 'build.gradle.kts' file.

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