chore: update VHS to v3.12.0

[wseymour15]

Description

Update http-streaming to version 3.12.0

This includes changes regarding the customPixelRatio vhs property, as well as some mux.js fixes regarding 608 captions.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.71%. Comparing base (42fe1e6) to head (d8aa2f2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8637   +/-   ##
=======================================
  Coverage   82.71%   82.71%           
=======================================
  Files         113      113           
  Lines        7636     7636           
  Branches     1835     1835           
=======================================
  Hits         6316     6316           
  Misses       1320     1320           

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