build(deps): bump express from 4.18.2 to 4.18.3 in /src (#6198)

Bumps [express](https://github.com/expressjs/express) from 4.18.2 to 4.18.3.
- [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/4.18.2...4.18.3)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/package.json

@@ -38,7 +38,7 @@
     "ejs": "^3.1.9",
     "etherpad-require-kernel": "^1.0.16",
     "etherpad-yajsml": "0.0.12",
-    "express": "4.18.2",
+    "express": "4.18.3",
     "express-rate-limit": "^7.1.5",
     "express-session": "npm:@etherpad/express-session@^1.18.2",
     "fast-deep-equal": "^3.1.3",