chore(deps-dev): bump c8 from 8.0.1 to 9.1.0

Bumps [c8](https://github.com/bcoe/c8) from 8.0.1 to 9.1.0.
- [Release notes](https://github.com/bcoe/c8/releases)
- [Changelog](https://github.com/bcoe/c8/blob/main/CHANGELOG.md)
- [Commits](bcoe/c8@v8.0.1...v9.1.0)

---
updated-dependencies:
- dependency-name: c8
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -39,7 +39,7 @@
     "@types/bluebird": "^3.5.36",
     "@types/graceful-fs": "^4.1.5",
     "@types/node": "^18.7.16",
-    "c8": "^8.0.0",
+    "c8": "^9.1.0",
     "chai": "^4.3.6",
     "eslint": "^8.23.0",
     "eslint-config-hexo": "^5.0.0",