build(deps): bump express-rate-limit from 6.8.1 to 6.9.0 in /src (#5865)

Bumps [express-rate-limit](https://github.com/express-rate-limit/express-rate-limit) from 6.8.1 to 6.9.0.
- [Release notes](https://github.com/express-rate-limit/express-rate-limit/releases)
- [Changelog](https://github.com/express-rate-limit/express-rate-limit/blob/main/changelog.md)
- [Commits](https://github.com/express-rate-limit/express-rate-limit/compare/v6.8.1...v6.9.0)

---
updated-dependencies:
- dependency-name: express-rate-limit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/package-lock.json

@@ -3461,9 +3461,9 @@
       }
     },
     "express-rate-limit": {
-      "version": "6.8.1",
-      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-6.8.1.tgz",
-      "integrity": "sha512-xJyudsE60CsDShK74Ni1MxsldYaIoivmG3ieK2tAckMsYCBewEuGalss6p/jHmFFnqM9xd5ojE0W2VlanxcOKg=="
+      "version": "6.9.0",
+      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-6.9.0.tgz",
+      "integrity": "sha512-AnISR3V8qy4gpKM62/TzYdoFO9NV84fBx0POXzTryHU/qGUJBWuVGd+JhbvtVmKBv37t8/afmqdnv16xWoQxag=="
     },
     "express-session": {
       "version": "npm:@etherpad/express-session@1.18.2",

src/package.json

@@ -39,7 +39,7 @@
     "etherpad-require-kernel": "^1.0.15",
     "etherpad-yajsml": "0.0.12",
     "express": "4.18.2",
-    "express-rate-limit": "^6.8.1",
+    "express-rate-limit": "^6.9.0",
     "express-session": "npm:@etherpad/express-session@^1.18.2",
     "fast-deep-equal": "^3.1.3",
     "find-root": "1.1.0",