Add file and files parameters to InteractionResponse.edit_message()

[baronkobama]

Summary

This PR adds the file and files parameters to the InteractionResponse.edit_message() method.

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why
• 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, typehinting, examples, ...)

[plun1331]

Maybe this could be implemented as well?

pycord/discord/message.py

Lines 1324 to 1326 in 70646f2

	if "attachments" not in payload:
	# don't want it to remove any attachments when we just add a new file
	payload["attachments"] = [a.to_dict() for a in self.attachments]