update mux.js to 4.1.4 and videojs-contrib-media-sources to 4.4.5 (#1117)

* ts probe searches packets for first it can successfully parse
* Fixed an issue that could cause updateend events to fire more than once per append or remove under very specific conditions on firefox

package.json

@@ -92,10 +92,10 @@
     "aes-decrypter": "1.0.3",
     "global": "^4.3.0",
     "m3u8-parser": "2.1.0",
-    "mux.js": "4.1.3",
+    "mux.js": "4.1.4",
     "url-toolkit": "1.0.9",
     "video.js": "^5.19.1",
-    "videojs-contrib-media-sources": "4.4.4",
+    "videojs-contrib-media-sources": "4.4.5",
     "webworkify": "1.0.2"
   },
   "devDependencies": {