[Backport 2.x] Fix typo in License.TXT

[opensearch-trigger-bot]

Backport 6d9a6af from #639

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (01a9896) to head (608712d).

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #640      +/-   ##
============================================
- Coverage     89.03%   88.92%   -0.11%     
+ Complexity      767      766       -1     
============================================
  Files            93       93              
  Lines          2746     2746              
  Branches        223      223              
============================================
- Hits           2445     2442       -3     
- Misses          221      223       +2     
- Partials         80       81       +1     

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