build(deps-dev): bump eslint in /apps/OpenSignServer

Bumps [eslint](https://github.com/eslint/eslint) from 9.11.1 to 9.12.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v9.11.1...v9.12.0)

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

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

apps/OpenSignServer/package.json

@@ -51,7 +51,7 @@
   "type": "module",
   "devDependencies": {
     "@babel/eslint-parser": "^7.25.7",
-    "eslint": "^9.11.1",
+    "eslint": "^9.12.0",
     "jasmine": "^5.3.1",
     "mongodb-runner": "^5.7.0",
     "nodemon": "^3.1.7",