Update dependency fs-extra to v8

Author: renovate-bot

package.json

@@ -51,7 +51,7 @@
   "dependencies": {
     "commander": "^2.6.0",
     "fast-xml-parser": "^3.12.13",
-    "fs-extra": "^7.0.0",
+    "fs-extra": "^8.0.0",
     "he": "^1.2.0",
     "koa": "^2.7.0",
     "koa-logger": "^3.2.0",