build(deps): bump mux.js from 5.11.3 to 5.12.0

Bumps [mux.js](https://github.com/videojs/mux.js) from 5.11.3 to 5.12.0.
- [Release notes](https://github.com/videojs/mux.js/releases)
- [Changelog](https://github.com/videojs/mux.js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/videojs/mux.js/compare/v5.11.3...v5.12.0)

---
updated-dependencies:
- dependency-name: mux.js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -16,7 +16,7 @@
         "css-loader": "^5.2.6",
         "dompurify": "^2.2.9",
         "hotkeys-js": "^3.8.7",
-        "mux.js": "^5.11.3",
+        "mux.js": "^5.12.0",
         "register-service-worker": "^1.7.1",
         "shaka-player": "3.1.1",
         "uikit": "3.7.0",