chore: Enable supply chain security through npm provenance attestation

[pupapaik]

Description

• Configure GitHub Actions workflow for secure publishing
• Enable automatic provenance generation during npm publish
• Add integrity verification through Sigstore transparency logs

Following the recent Lottie-Player supply chain attack, it's crucial to enhance package security. NPM provenance provides cryptographic proof that this package was built from this repository using GitHub Actions, making supply chain attacks significantly harder. More info in my blog post https://medium.com/exaforce/npm-provenance-the-missing-security-layer-in-popular-javascript-libraries-b50107927008

Specific Changes proposed

Changes the workflow github to publish provenance attestation on https://www.npmjs.com/package/video.js

Requirements Checklist

• Feature implemented in CI/CD
• 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)
  • [ x Has no DOM changes which impact accessiblilty or trigger warnings (e.g. Chrome issues tab)
  • Has no changes to JSDoc which cause npm run docs:api to error
• Reviewed by Two Core Contributors

[welcome]

💖 Thanks for opening this pull request! 💖

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• Run npm run lint -- --errors locally to catch formatting errors earlier.
• Include tests when adding/changing behavior.
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We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.26%. Comparing base (ecef37c) to head (18c1183).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8911      +/-   ##
==========================================
+ Coverage   83.25%   83.26%   +0.01%     
==========================================
  Files         120      120              
  Lines        8097     8097              
  Branches     1944     1944              
==========================================
+ Hits         6741     6742       +1     
+ Misses       1356     1355       -1     

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