[AUTO] Increment version to 2.12.1-SNAPSHOT

[opensearch-trigger-bot]

• Incremented version to 2.12.1-SNAPSHOT.

[reta]

Blocked by opensearch-project/opensearch-build#4471

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.46%. Comparing base (a5c3191) to head (c672050).

Additional details and impacted files

@@            Coverage Diff             @@
##             2.12    #4064      +/-   ##
==========================================
- Coverage   65.47%   65.46%   -0.02%     
==========================================
  Files         297      297              
  Lines       21052    21052              
  Branches     3443     3443              
==========================================
- Hits        13784    13781       -3     
- Misses       5557     5560       +3     
  Partials     1711     1711              

see 2 files with indirect coverage changes