[Backport 2.12] [Backport] [2.x] Update to Gradle 8.5 (#617)

[opensearch-trigger-bot[bot]]

Backport f8666dacaa24c25b8ba89a1107079d22fe4a2cde from #619

[codecov[bot]]

Codecov Report

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

Comparison is base (1d6e66e) 68.62% compared to head (c342006) 68.70%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.12 #620 +/- ## ============================================ + Coverage 68.62% 68.70% +0.08% Complexity 365 365 ============================================ Files 43 43 Lines 2473 2473 Branches 172 172 ============================================ + Hits 1697 1699 +2 + Misses 672 671 -1 + Partials 104 103 -1 ```

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