Upgrade to Gradle 8.5

[msfroh]

This is in preparation for the upgrade to JDK 21.

Description

This is in preparation for the upgrade to JDK 21.

Issues Resolved

Related to opensearch-project/OpenSearch#10334

Check List

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f7570dd) 83.30% compared to head (bc79a41) 83.30%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #213   +/-   ##
=========================================
  Coverage     83.30%   83.30%           
  Complexity      337      337           
=========================================
  Files            43       43           
  Lines          1270     1270           
  Branches        155      155           
=========================================
  Hits           1058     1058           
  Misses          134      134           
  Partials         78       78           

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[reta]

@msfroh could you please add JDK-21 to build matrix (Github Actions)? thank you

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-213-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 af87aa78a352ba7e4e61004165f361814243a4e3
# Push it to GitHub
git push --set-upstream origin backport/backport-213-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-213-to-2.x.