Update base file size limit

[Vioshim]

Summary

It updates the file size limit based on the recent modification to discord's API
https://twitter.com/discord/status/1645522780337885184

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[Vioshim]

Hmm probably best to keep this on hold until discord properly documents their limits
Saw other tweets push more changes
https://twitter.com/discord/status/1645530415783108608

[Vioshim]

After testing, discord bots and webhooks are still capped to the 8mb and pre-defined Tiers. For this reason change is not needed.

[Puncher1]

This could be reopened because it seems like it got added to bots and webhooks today: discord/discord-api-docs#6078