[Backport] [2.x] Update to Gradle 8.5 (#528)

[reta]

Is your feature request related to a problem? Please provide an existing Issue # , or describe. Backport of https://github.com/opensearch-project/performance-analyzer-rca/pull/528 to 2.x

Describe the solution you are proposing A clear and concise description of what you want to happen.

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.

Check List

• [ ] Backport Labels added.
• [ ] New functionality includes testing.
  • [ ] All tests pass
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
• [ ] Commits are signed per the DCO using --signoff

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[reta]

@ansjcy backport to 2.x

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c865f80) 75.67% compared to head (057d1ad) 75.66%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.x #535 +/- ## ============================================ - Coverage 75.67% 75.66% -0.02% Complexity 2581 2581 ============================================ Files 303 303 Lines 15415 15414 -1 Branches 1218 1218 ============================================ - Hits 11666 11663 -3 - Misses 3259 3262 +3 + Partials 490 489 -1 ```

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[reta]

@ansjcy @getsaurabh02 folks could we merge this one to unblock the backport to performance-analyzer? thank you