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MINOR: [Java] Update mockito version to 5.14.2 (#44566)

### What changes are included in this PR?

Update Mockito version to latest/current version (5.14.2).

Also remove mockito-inline dependency as the code is now part of mockito-core.

Fixes Java 23 compatibility

### Are these changes tested?

CI/CD (no new tests)

### Are there any user-facing changes?

No

Authored-by: Laurent Goujon <laurent@apache.org>
Signed-off-by: David Li <li.davidm96@gmail.com>