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

[awais-ansari]

Summary
Bumps @edx/frontend-component-header from ^8.1.0 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 94.64%. Comparing base (091686f) to head (4d1bbfa).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #865   +/-   ##
=======================================
  Coverage   94.64%   94.64%           
=======================================
  Files         164      164           
  Lines        3623     3623           
  Branches      998      993    -5     
=======================================
  Hits         3429     3429           
  Misses        181      181           
  Partials       13       13           

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