[Backport 2.x] Bump actions/download-artifact from 3 to 4

[opensearch-trigger-bot]

Backport 217c382 from #11631.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 7ae81d7

Incompatible components

Incompatible components: [https://github.com/opensearch-project/security-analytics.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/performance-analyzer.git]

[github-actions]

✅ Gradle check result for 7ae81d7: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (072ee3c) 71.10% compared to head (7ae81d7) 71.15%.
Report is 2 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11637      +/-   ##
============================================
+ Coverage     71.10%   71.15%   +0.05%     
- Complexity    59322    59325       +3     
============================================
  Files          4883     4883              
  Lines        279308   279308              
  Branches      40934    40934              
============================================
+ Hits         198602   198750     +148     
+ Misses        63941    63736     -205     
- Partials      16765    16822      +57     

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