build(deps): bump mongodb from 5.9.2 to 7.0.0 in /apps/OpenSignServer

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) from 5.9.2 to 7.0.0.
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/main/HISTORY.md)
- [Commits](mongodb/node-mongodb-native@v5.9.2...v7.0.0)

---
updated-dependencies:
- dependency-name: mongodb
  dependency-version: 7.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

apps/OpenSignServer/package.json

@@ -39,7 +39,7 @@
     "googleapis": "^166.0.0",
     "libreoffice-convert": "^1.7.0",
     "mailgun.js": "^12.2.0",
-    "mongodb": "^5.9.2",
+    "mongodb": "^7.0.0",
     "multer": "^2.0.2",
     "multer-s3": "^3.0.1",
     "node-forge": "^1.3.1",