refactor: bump eslint from 9.20.1 to 9.21.0

Bumps [eslint](https://github.com/eslint/eslint) from 9.20.1 to 9.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.20.1...v9.21.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -61,7 +61,7 @@
     "codecov": "3.8.3",
     "core-js": "3.40.0",
     "cross-env": "7.0.2",
-    "eslint": "9.20.1",
+    "eslint": "9.21.0",
     "eslint-plugin-expect-type": "0.6.2",
     "eslint-plugin-jsdoc": "50.6.3",
     "express": "4.21.2",