Incremented version to 2.1.1.

[gaiksaya]

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

[codecov-commenter]

Codecov Report

Merging #198 (0a2e5e3) into 2.1 (b9ed1fc) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 0a2e5e3 differs from pull request most recent head c408042. Consider uploading reports for the commit c408042 to get more accurate results

@@             Coverage Diff              @@
##                2.1     #198      +/-   ##
============================================
- Coverage     71.54%   71.51%   -0.03%     
  Complexity     2986     2986              
============================================
  Files           380      380              
  Lines         18952    18952              
  Branches       1463     1463              
============================================
- Hits          13559    13554       -5     
- Misses         4796     4801       +5     
  Partials        597      597              

Impacted Files	Coverage Δ
...nceanalyzer/rca/samplers/MetricsDBFileSampler.java	75.00% <0.00%> (-9.10%)	⬇️
.../org/opensearch/performanceanalyzer/core/Util.java	62.50% <0.00%> (-8.34%)	⬇️
...performanceanalyzer/collectors/StatsCollector.java	93.33% <0.00%> (+0.74%)	⬆️

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[gaiksaya]

Closing this as 2.2.0 is released and this version won't be released now.
Thanks!