chore: update mpd-parser to v1.2.1 (#1420)

Author: wseymour15

package-lock.json

@@ -62,7 +62,7 @@
     "aes-decrypter": "4.0.1",
     "global": "^4.4.0",
     "m3u8-parser": "^7.1.0",
-    "mpd-parser": "^1.1.1",
+    "mpd-parser": "^1.2.1",
     "mux.js": "7.0.0",
     "video.js": "^7 || ^8"
   },