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 98.19%. Comparing base (0ba2051) to head (3711634).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #834   +/-   ##
=======================================
  Coverage   98.19%   98.19%           
=======================================
  Files         145      145           
  Lines        1388     1388           
  Branches      293      298    +5     
=======================================
  Hits         1363     1363           
  Misses         25       25           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.