test: update tests

[NotSugden]

Please describe the changes this PR makes and why it should be merged:
This PR updates the test files to use v12 methods instead of v11 methods

Status

• Code changes have been tested against the Discord API, or there are no code changes
• Haven't had time to test it all, but i believe it should work
• I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• This PR changes the library's interface (methods or parameters added)
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
• This PR only includes non-code changes, like changes to documentation, README, etc.

[Jiralite]

Hey! Also, it seems that in the file random.js, lines 98 to 102 lack the .cache to access the Collection!