fix(package): update mux.js to 6.0.1

[gesinger]

Description

Fixes a syntax error in IE11

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #1242 (bbc1fd9) into main (4800b25) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1242   +/-   ##
=======================================
  Coverage   86.31%   86.31%           
=======================================
  Files          39       39           
  Lines        9807     9807           
  Branches     2279     2279           
=======================================
  Hits         8465     8465           
  Misses       1342     1342           

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