chore: fix missing dependency

Author: velut

package.json

@@ -58,6 +58,7 @@
   "dependencies": {
     "@microsoft/tsdoc": "^0.14.2",
     "execa": "^8.0.1",
+    "fs-extra": "^11.2.0",
     "memoize": "^10.0.0",
     "natural-orderby": "^3.0.2",
     "neverthrow": "^6.1.0",
@@ -72,6 +73,7 @@
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.13.10",
     "@total-typescript/shoehorn": "^0.1.1",
+    "@types/fs-extra": "^11.0.4",
     "@types/validate-npm-package-name": "^4.0.2",
     "@vitest/coverage-v8": "^1.3.0",
     "np": "^9.2.0",