Removed fs-extra dependency (#481)

* Removed `fs-extra` dependency

* use `fs/promises` consistently

package.json

@@ -7,7 +7,6 @@
     "@changesets/changelog-github": "^0.4.2",
     "@changesets/cli": "^2.20.0",
     "@changesets/write": "^0.1.6",
-    "@types/fs-extra": "^8.0.0",
     "@types/node": "^22.15.17",
     "@types/semver": "^7.5.0",
     "esbuild": "^0.25.4",
@@ -41,7 +40,6 @@
     "@octokit/core": "^5.2.1",
     "@octokit/plugin-throttling": "^8.0.0",
     "@types/mdast": "^3.0.0",
-    "fs-extra": "^8.1.0",
     "mdast-util-to-string": "^1.0.6",
     "remark-parse": "^7.0.1",
     "remark-stringify": "^7.0.3",