chore: upgrade @edx/frontend-component-header to ^8.2.1

[awais-ansari]

Summary

• Bumps @edx/frontend-component-header from ^8.0.0 to ^8.2.1

Test plan

• Verify header renders correctly on course pages
• Verify no visual regressions in the header across learner-facing views

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.29%. Comparing base (5fbfa0a) to head (c912a3b).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1903   +/-   ##
=======================================
  Coverage   91.29%   91.29%           
=======================================
  Files         343      343           
  Lines        5770     5770           
  Branches     1388     1388           
=======================================
  Hits         5268     5268           
  Misses        483      483           
  Partials       19       19           

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