build(deps): bump express

Bumps the npm_and_yarn group in /apps/OpenSignServer with 1 update: [express](https://github.com/expressjs/express).


Updates `express` from 4.19.2 to 4.20.0
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](https://github.com/expressjs/express/compare/4.19.2...4.20.0)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

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

apps/OpenSignServer/package.json

@@ -28,7 +28,7 @@
     "axios": "^1.7.7",
     "cors": "^2.8.5",
     "dotenv": "^16.4.5",
-    "express": "^4.19.2",
+    "express": "^4.20.0",
     "form-data": "^4.0.0",
     "generate-api-key": "^1.0.2",
     "googleapis": "^140.0.1",