Remove unused file-system dependency (#67)

CVE-2020-8147: GHSA-6pq3-928q-x6w6

Author: hoijnet

package.json

@@ -21,7 +21,6 @@
   "license": "Apache-2.0",
   "dependencies": {
     "axios": ">=0.21.4",
-    "file-system": "^2.2.2",
     "path-parse": ">=1.0.7",
     "sockjs": ">=0.3.20",
     "ssri": ">=6.0.2",