Update rate limit

[adamelfstrom]

The rate limit of the API has been increased from 4/s to 5/s a couple of years back.

In PR #258 this limit was increased in the SDK, but was shortly reverted due to concerns of inconsistencies between legacy tokens and the new OAuth2 workflow.
After some tests with both authentication methods, it seems they are both using the same sliding window now.

Closes #322

[adamelfstrom]

There might be a point in investigating if we should abandon the RateLimiter package since it seems to have been deprecated and might have some issues.

While testing I also ran in to an issue with this package as it seems to make requests a bit too quickly, resulting in a Too Many Requests error from the API if we set the requests per second to 5.

This is the reason for this PR increasing the requests per second to 4.8, rather than 5 (24 per 5 seconds instead of 25 per 5 seconds)