[Snyk] Upgrade express-rate-limit from 5.4.1 to 6.0.1

Snyk has created this PR to upgrade express-rate-limit from 5.4.1 to 6.0.1.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

Warning: This is a major version upgrade, and may be a breaking change.

The recommended version is 4 versions ahead of your current version.
The recommended version was released 21 days ago, on 2021-12-25.

Release notes

Package name: express-rate-limit

6.0.1 - 2021-12-25
Fixed
- Ensure CommonJS projects can import the module.
6.0.0 - 2021-12-24
Added
- express 4.x as a peer dependency.
- Better Typescript support (the library was rewritten in Typescript).
- Export the package as both ESM and CJS.
- Publish the built package (.tgz file) on GitHub releases as well as the npm registry.
- Issue and PR templates.
- A contributing guide.
Changed
- Rename the draft_polli_ratelimit_headers option to standardHeaders.
- Rename the headers option to legacyHeaders.
- Retry-After header is now sent if either legacyHeaders or standardHeaders is set.
- Allow keyGenerator to be an async function/return a promise.
- Change the way custom stores are defined.
  - Add the init method for stores to set themselves up using options passed to the middleware.
  - Rename the incr method to increment.
  - Allow the increment, decrement, resetKey and resetAll methods to return a promise.
  - Old stores will automatically be promisified and used.
- The package can now only be used with NodeJS version 12.9.0 or greater.
- The onLimitReached configuration option is now deprecated. Replace it with a custom handler that checks the number of hits.
Removed
- Remove the deprecated limiter.resetIp method (use the limiter.resetKey method instead).
- Remove the deprecated options delayMs, delayAfter (the delay functionality was moved to the express-slow-down package) and global (use a key generator that returns a constant value).
5.5.1 - 2021-11-06
5.5.1
5.5.0 - 2021-10-12
5.5.0
5.4.1 - 2021-10-05
5.4.1