build(deps-dev): bump mux.js from 5.8.0 to 5.9.1

Bumps [mux.js](https://github.com/videojs/mux.js) from 5.8.0 to 5.9.1.
- [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/v5.8.0...v5.9.1)

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

package-lock.json

@@ -10110,10 +10110,13 @@
       "dev": true
     },
     "mux.js": {
-      "version": "5.8.0",
-      "resolved": "https://registry.npmjs.org/mux.js/-/mux.js-5.8.0.tgz",
-      "integrity": "sha512-v56I2YPyCq1bVbXW7vcuvQs8iHrDy7AeXsZyG1kxCxBUqUjZD0Xq/cU1wrd5dy9YTxRpvw37aTQ4ILwi40GXiw==",
-      "dev": true
+      "version": "5.9.1",
+      "resolved": "https://registry.npmjs.org/mux.js/-/mux.js-5.9.1.tgz",
+      "integrity": "sha512-EWDCIemLUoTriIQpEHEfKO8hldujpiBYIqC6ilsMaNbd+1hhGoh/w1MZIhP5wkq+tkS+HfnrnNtyfamyXWfnPg==",
+      "dev": true,
+      "requires": {
+        "@babel/runtime": "^7.11.2"
+      }
     },
     "mz": {
       "version": "2.7.0",

package.json

@@ -44,7 +44,7 @@
     "fast-xml-parser": "^3.17.6",
     "husky": "^4.3.7",
     "lint-staged": "^10.5.3",
-    "mux.js": "^5.8.0",
+    "mux.js": "^5.9.1",
     "sass": "^1.32.5",
     "sass-loader": "^10.1.1",
     "shaka-player": "^3.0.7",