build(deps): bump express-rate-limit from 5.5.1 to 6.7.0

Bumps [express-rate-limit](https://github.com/express-rate-limit/express-rate-limit) from 5.5.1 to 6.7.0.
- [Release notes](https://github.com/express-rate-limit/express-rate-limit/releases)
- [Changelog](https://github.com/express-rate-limit/express-rate-limit/blob/master/changelog.md)
- [Commits](express-rate-limit/express-rate-limit@v5.5.1...v6.7.0)

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

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

package.json

@@ -39,7 +39,7 @@
     "csurf": "^1.11.0",
     "express": "^4.16.4",
     "express-prom-bundle": "^6.3.6",
-    "express-rate-limit": "^5.2.3",
+    "express-rate-limit": "^6.7.0",
     "express-session": "^1.17.3",
     "global-agent": "^3.0.0",
     "got": "^11.8.1",