Update Gradle to 8.4

[reta]

Description

Update Gradle to 8.4

Issues Resolved

Part of 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 per the DCO using --signoff

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[codecov]

Codecov Report

Attention: 136 lines in your changes are missing coverage. Please review.

Comparison is base (5759bf2) 79.67% compared to head (c26b9eb) 80.77%.
Report is 25 commits behind head on main.

Files	Patch %	Lines
...n/java/org/opensearch/ml/model/MLModelManager.java	10.34%	26 Missing ⚠️
.../opensearch/ml/common/connector/HttpConnector.java	0.00%	20 Missing ⚠️
...rithms/metrics_correlation/MetricsCorrelation.java	14.28%	11 Missing and 1 partial ⚠️
...tion/prediction/TransportPredictionTaskAction.java	71.05%	9 Missing and 2 partials ⚠️
...a/org/opensearch/ml/model/MLModelGroupManager.java	70.96%	5 Missing and 4 partials ⚠️
...search/ml/helper/ConnectorAccessControlHelper.java	69.23%	7 Missing and 1 partial ⚠️
...va/org/opensearch/ml/task/MLPredictTaskRunner.java	46.15%	4 Missing and 3 partials ⚠️
...ommon/transport/register/MLRegisterModelInput.java	62.50%	5 Missing and 1 partial ⚠️
...n/model_group/TransportUpdateModelGroupAction.java	79.16%	4 Missing and 1 partial ⚠️
...h/ml/action/models/UpdateModelTransportAction.java	96.50%	3 Missing and 2 partials ⚠️
... and 12 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1612      +/-   ##
============================================
+ Coverage     79.67%   80.77%   +1.10%     
- Complexity     4020     4185     +165     
============================================
  Files           394      399       +5     
  Lines         16385    16881     +496     
  Branches       1754     1817      +63     
============================================
+ Hits          13055    13636     +581     
+ Misses         2654     2531     -123     
- Partials        676      714      +38     

Flag	Coverage Δ
ml-commons	80.77% <79.73%> (+1.10%)	⬆️

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