chore(deps): bump express from 4.21.2 to 4.22.0

Bumps [express](https://github.com/expressjs/express) from 4.21.2 to 4.22.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.22.0/History.md)
- [Commits](https://github.com/expressjs/express/compare/4.21.2...4.22.0)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 4.22.0
  dependency-type: direct:production
...

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

plugins/signals-node/package.json

@@ -42,7 +42,7 @@
     "@backstage/plugin-auth-node": "workspace:^",
     "@backstage/plugin-events-node": "workspace:^",
     "@backstage/types": "workspace:^",
-    "express": "^4.17.1",
+    "express": "^4.22.0",
     "uuid": "^11.0.0",
     "ws": "^8.18.0"
   },