[SPARK-52477] Upgrade JUnit to 5.13.1 and Mockito to 5.18.0

### What changes were proposed in this pull request?

This PR aims to upgrade `JUnit` to 5.13.1 and `Mockito` to `5.18.0`.

### Why are the changes needed?

To bring the latest improvements and bug fixes.
- https://junit.org/junit5/docs/5.13.1/release-notes/
- https://junit.org/junit5/docs/5.13.0/release-notes/
- https://github.com/mockito/mockito/releases/tag/v5.18.0

### Does this PR introduce _any_ user-facing change?

No, these are test dependencies.

### How was this patch tested?

Pass the CIs.

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

No.

Closes apache#245 from dongjoon-hyun/SPARK-52477.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: dongjoon-hyun

gradle/libs.versions.toml

@@ -24,9 +24,9 @@ spark = "4.0.0"
 log4j = "2.24.3"
 
 # Test
-junit = "5.12.2"
+junit = "5.13.1"
 jacoco = "0.8.13"
-mockito = "5.17.0"
+mockito = "5.18.0"
 
 # Build Analysis
 checkstyle = "10.23.1"