feat: bump @typescript-eslint/eslint-plugin from 6.6.0 to 6.21.0

Bumps [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) from 6.6.0 to 6.21.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v6.21.0/packages/eslint-plugin)

---
updated-dependencies:
- dependency-name: "@typescript-eslint/eslint-plugin"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -80,7 +80,7 @@
     "@types/express": "^4.17.21",
     "@types/jsonwebtoken": "9.0.6",
     "@types/node": "^20.4.9",
-    "@typescript-eslint/eslint-plugin": "6.6.0",
+    "@typescript-eslint/eslint-plugin": "6.21.0",
     "@typescript-eslint/parser": "6.6.0",
     "@vitest/coverage-v8": "1.4.0",
     "eslint": "8.48.0",