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

Author: renovate[bot]

package-lock.json

@@ -17,7 +17,7 @@
   },
   "devDependencies": {
     "@webtorrent/semantic-release-config": "^1.0.9",
-    "bittorrent-protocol": "4.1.18",
+    "bittorrent-protocol": "4.1.21",
     "brfs": "2.0.2",
     "standard": "*",
     "tape": "5.9.0",