chore(deps): update dependency bittorrent-protocol to v4.1.21

Author: renovate[bot]

package.json

@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "@webtorrent/semantic-release-config": "1.0.10",
-    "bittorrent-protocol": "4.1.20",
+    "bittorrent-protocol": "4.1.21",
     "nyc": "15.1.0",
     "semantic-release": "21.1.2",
     "standard": "*",