fix: upgrade rate-limiter-flexible from 2.3.0 to 2.3.1

Snyk has created this PR to upgrade rate-limiter-flexible from 2.3.0 to 2.3.1.

See this package in npm:
https://www.npmjs.com/package/rate-limiter-flexible

See this project in Snyk:
https://app.snyk.io/org/johnmclear/project/d9a12bfb-7ccd-443f-9e22-f30d339cc8c5?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

src/package-lock.json

@@ -57,7 +57,7 @@
     "npm": "^6.14.15",
     "openapi-backend": "^4.2.0",
     "proxy-addr": "^2.0.7",
-    "rate-limiter-flexible": "^2.3.0",
+    "rate-limiter-flexible": "^2.3.1",
     "rehype": "^11.0.0",
     "rehype-minify-whitespace": "^4.0.5",
     "request": "2.88.2",