fix(deps): update frontend-lib-learning-assistant to v2.21.1

[mraman-2U]

Description:
This pull request updates the version of @edx/frontend-lib-learning-assistant in the package.json file from ^2.20.0 to ^2.21.1. This release has an updated Chat API V2. The usage of the V2 api can be enabled through a feature flag.

JIRA: COSMO-700 (private)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.46%. Comparing base (b050535) to head (8a389eb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1761   +/-   ##
=======================================
  Coverage   90.46%   90.46%           
=======================================
  Files         344      344           
  Lines        5812     5812           
  Branches     1360     1360           
=======================================
  Hits         5258     5258           
  Misses        537      537           
  Partials       17       17           

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