Remove unused dependency split2

This was used with now-removed `--link`.

package.json

@@ -49,7 +49,6 @@
     "@types/proxy-from-env": "^1.0.1",
     "@types/safe-compare": "^1.1.0",
     "@types/semver": "^7.1.0",
-    "@types/split2": "^3.2.0",
     "@types/trusted-types": "^2.0.2",
     "@types/ws": "^8.5.3",
     "@typescript-eslint/eslint-plugin": "^5.41.0",
@@ -105,7 +104,6 @@
     "safe-buffer": "^5.1.1",
     "safe-compare": "^1.1.4",
     "semver": "^7.1.3",
-    "split2": "^4.0.0",
     "ws": "^8.0.0",
     "xdg-basedir": "^4.0.0"
   },