Bump typescript-eslint from 8.20.0 to 8.21.0 (#312)

Bumps [typescript-eslint](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/typescript-eslint) from 8.20.0 to 8.21.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/typescript-eslint/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v8.21.0/packages/typescript-eslint)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -39,7 +39,7 @@
     "ts-jest": "^29.2.5",
     "ts-node": "^10.9.2",
     "typescript": "^5.7.3",
-    "typescript-eslint": "^8.20.0",
+    "typescript-eslint": "^8.21.0",
     "vite": "^6.0.9",
     "vite-plugin-version-mark": "^0.1.4"
   },