[SPARK-51951] Upgrade Gradle to 8.14

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to upgrade Gradle to 8.14.

Why are the changes needed?

To bring new features and bug fixes.

• https://docs.gradle.org/8.14/release-notes.html (2025-04-25)

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Pass the CIs and check the logs.

Welcome to Gradle 8.14!
Here are the highlights of this release:
 - Java 24 support
 - GraalVM Native Image toolchain selection
 - Enhancements to test reporting
 - Build Authoring improvements

Was this patch authored or co-authored using generative AI tooling?

No.

[viirya]

Pending CI

[dongjoon-hyun]

Thank you, @viirya ! All tests passed.
Merged to main.