Bump GitHub Actions

[hugovk]

Description

Describe what this change achieves.

Upgrade GitHub Actions. Fixes warnings like:

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/checkout@v3, actions/setup-python@v4. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

https://github.com/opensearch-project/opensearch-py/actions/runs/10021605601

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.66%. Comparing base (ba715b9) to head (d2ae6fc).
Report is 39 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #786      +/-   ##
==========================================
- Coverage   71.95%   70.66%   -1.29%     
==========================================
  Files          91      105      +14     
  Lines        8001     8628     +627     
==========================================
+ Hits         5757     6097     +340     
- Misses       2244     2531     +287     

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