Update dependency mp4-muxer to v5.2.1 (#151)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -51,7 +51,7 @@
     "eslint": "9.23.0",
     "eslint-import-resolver-typescript": "4.2.5",
     "globals": "16.0.0",
-    "mp4-muxer": "5.2.0",
+    "mp4-muxer": "5.2.1",
     "opentype.js": "1.3.4",
     "playcanvas": "2.6.1",
     "rollup": "4.37.0",