Bump fs-extra from 8.1.0 to 9.0.0

Bumps [fs-extra](https://github.com/jprichardson/node-fs-extra) from 8.1.0 to 9.0.0.
- [Release notes](https://github.com/jprichardson/node-fs-extra/releases)
- [Changelog](https://github.com/jprichardson/node-fs-extra/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jprichardson/node-fs-extra/compare/8.1.0...9.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -64,7 +64,7 @@
     "eslint-config-openlayers": "^13.0.0",
     "expect.js": "0.3.1",
     "front-matter": "^3.0.2",
-    "fs-extra": "^8.0.0",
+    "fs-extra": "^9.0.0",
     "glob": "^7.1.5",
     "globby": "^11.0.0",
     "handlebars": "4.7.3",