chore(package): update mux.js to 6.3.0

[adrums86]

Description

Updating mux.js to 6.3.0 to provide the emsg probe functions for this PR which will add emsg ID3 tag support to VHS.

Specific Changes proposed

Changing the version of mux.js used from 6.2.0 to 6.3.0.

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 #1372 (124a630) into main (343f682) will decrease coverage by 0.70%.
The diff coverage is n/a.

❗ Current head 124a630 differs from pull request most recent head d85c47f. Consider uploading reports for the commit d85c47f to get more accurate results

@@            Coverage Diff             @@
##             main    #1372      +/-   ##
==========================================
- Coverage   86.03%   85.34%   -0.70%     
==========================================
  Files          40       40              
  Lines        9855     9953      +98     
  Branches     2295     2311      +16     
==========================================
+ Hits         8479     8494      +15     
- Misses       1376     1459      +83     

Impacted Files	Coverage Δ
src/transmuxer-worker.js	71.65% <0.00%> (-1.51%)	⬇️

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