Incremented version to 2.1.1.

[gaiksaya]

Coming from opensearch-project/opensearch-build#1818 post release activities.

[codecov-commenter]

Codecov Report

Merging #365 (d8dad1e) into 2.1 (dea4de1) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.1     #365      +/-   ##
============================================
- Coverage     92.09%   91.96%   -0.14%     
+ Complexity      519      518       -1     
============================================
  Files            58       58              
  Lines          1481     1481              
  Branches        116      116              
============================================
- Hits           1364     1362       -2     
- Misses           78       79       +1     
- Partials         39       40       +1     

Flag	Coverage Δ
ml-commons	91.96% <ø> (-0.14%)	⬇️

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Impacted Files	Coverage Δ
.../java/org/opensearch/ml/task/MLTaskDispatcher.java	96.82% <0.00%> (-3.18%)	⬇️

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