fix(deps): update dependency @edx/frontend-component-header to v6.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@edx/frontend-component-header	6.2.0 -> 6.4.0

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Release Notes

openedx/frontend-component-header (@​edx/frontend-component-header)

v6.4.0

Compare Source

Features

• standardize slot ids (#​589) (95efe7f)

v6.3.0

Compare Source

Features

• added laber for header dropdown btn (e084199)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.18%. Comparing base (4cc716b) to head (d50774c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1684   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files         338      338           
  Lines        5726     5726           
  Branches     1382     1382           
=======================================
  Hits         5164     5164           
  Misses        543      543           
  Partials       19       19           

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