[AUTO] Increment version to 3.9.0-SNAPSHOT

[opensearch-ci-bot]

• Incremented version to 3.9.0-SNAPSHOT.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.52%. Comparing base (9cb092f) to head (47249f7).
⚠️ Report is 70 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #970      +/-   ##
============================================
- Coverage     70.88%   70.52%   -0.36%     
- Complexity      421      526     +105     
============================================
  Files            49       56       +7     
  Lines          3125     3664     +539     
  Branches        194      244      +50     
============================================
+ Hits           2215     2584     +369     
- Misses          785      918     +133     
- Partials        125      162      +37     

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