Update Gradle to 9.4.1 and Jacoco to 0.8.14

[rithinpullela]

Description

Bumps the Gradle wrapper from 9.2.0 → 9.4.1 and the Jacoco tool version from 0.8.13 → 0.8.14. This mirrors the change already landed in OpenSearch core: opensearch-project/OpenSearch#21153 (merged 2026-04-07).

Why

OpenSearch's build-tools GlobalBuildInfoPlugin now requires Gradle 9.4.1+. Since ml-commons still pins the wrapper to 9.2.0, every CI run — including pushes to main — fails during project evaluation with:

* What went wrong:
A problem occurred evaluating project ':opensearch-ml-plugin'.
> Failed to apply plugin class 'org.opensearch.gradle.info.GlobalBuildInfoPlugin'.
   > Gradle 9.4.1+ is required

Failing CI examples

• PR feat: Add opt-in settings to enforce unique Agent and Agentic Memory Container names #4808 Spotless Check: runs/25388318335 — fails before spotless can even run, during project evaluation.
• main Build and Test (commit 20889dc2a): runs/25350445058 — same failure, not PR-specific.
• Multiple consecutive main runs have been red for the same reason.

Precedence

OpenSearch core hit and fixed this exact issue one month ago in opensearch-project/OpenSearch#21153:

• Same Gradle target (9.4.1) and same SHA-256.
• Same Jacoco bump (0.8.13 → 0.8.14).
• This PR's diff is byte-identical to core's, just applied to ml-commons' root build.gradle (where the jacoco.toolVersion lives) instead of core's gradle/code-coverage.gradle.

Sibling plugin repos (neural-search, k-NN) are still on 9.2.0 and will need the same bump.

Changes

• gradle/wrapper/gradle-wrapper.properties: gradle-9.2.0-all.zip → gradle-9.4.1-all.zip (+ updated SHA-256; line ordering matched to core).
• build.gradle: jacoco.toolVersion = '0.8.13' → '0.8.14'.

Test plan

• Ran ./gradlew spotlessCheck locally with the updated wrapper — BUILD SUCCESSFUL across all 7 modules.
• CI spotless job goes green on this PR.
• CI Build and Test job proceeds past project evaluation.

Issues resolved

Unblocks all failing CI runs on main and on open PRs caused by the Gradle version requirement.

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.

[github-actions]

PR Code Analyzer ❗

AI-powered 'Code-Diff-Analyzer' found issues on commit 5a6efea.

Path	Line	Severity	Description
gradle/wrapper/gradle-wrapper.properties	4	high	Gradle wrapper distribution URL changed from 9.2.0 to 9.4.1. The SHA256 checksum was also replaced (old: 16f2b95838c1ddcf7242b1c39e7bbbb43c842f1f1a1a0dc4959b6d4d68abcac3, new: 708d2c6ecc97ca9a11838ef64a6c2301151b8dd10387e22dc1a12c30557cab5b). The Gradle wrapper is a privileged build bootstrapping mechanism — a tampered or substituted distribution could execute arbitrary code during any build. Maintainers must verify the new checksum matches the official Gradle 9.4.1 release at services.gradle.org.
build.gradle	85	high	JaCoCo tool version bumped from 0.8.13 to 0.8.14. Per mandatory supply chain policy, all dependency version changes must be flagged. Maintainers should verify this version exists in the official JaCoCo release history and that the artifact hash matches the expected value before merging.

The table above displays the top 10 most important findings.

Total: 2 | Critical: 0 | High: 2 | Medium: 0 | Low: 0

---

Pull Requests Author(s): Please update your Pull Request according to the report above.

Repository Maintainer(s): You can bypass diff analyzer by adding label skip-diff-analyzer after reviewing the changes carefully, then re-run failed actions. To re-enable the analyzer, remove the label, then re-run all actions.

---

⚠️ Note: The Code-Diff-Analyzer helps protect against potentially harmful code patterns. Please ensure you have thoroughly reviewed the changes beforehand.

Thanks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.42%. Comparing base (12f884e) to head (5a6efea).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4811   +/-   ##
=========================================
  Coverage     77.42%   77.42%           
  Complexity    11907    11907           
=========================================
  Files           963      963           
  Lines         53326    53326           
  Branches       6503     6503           
=========================================
+ Hits          41285    41289    +4     
+ Misses         9289     9288    -1     
+ Partials       2752     2749    -3     

Flag	Coverage Δ
ml-commons	77.42% <ø> (+<0.01%)	⬆️

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