Update to Gradle 8.4

[reta]

Description

Update to Gradle 8.4

Issues Resolved

• Related [META] Ensure JDK-21 (baseline) ecosystem readiness  OpenSearch#10334

Testing

N/A

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed 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.

[peternied]

This is the point where I'd normally ask if could you also update the bwc-test directory. However, I've got what I think is a better offer, want to merge [1] this change that removes the separate gradle install entirely?

• [1] Remove the separate gradle install for bwc-tests reta/security#2

[reta]

This is the point where I'd normally ask if could you also update the bwc-test directory.

Uh ... I am always forgetting about this one :( We could do 2 step: merge this and than your pull request, wdyt? thank you

[DarshitChanpura]

I'm fine moving forward either way.

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/security/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/security/backport-2.x
# Create a new branch
git switch --create backport/backport-3638-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 5de968656d409c8bb0da23ad06f8308b0c9b1443
# Push it to GitHub
git push --set-upstream origin backport/backport-3638-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/security/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-3638-to-2.x.