Bump discord-py from 2.3.2 to 2.4.0

[dependabot[bot]]

Bumps discord-py from 2.3.2 to 2.4.0.

Commits

• 978a96b Version bump to v2.4.0
• c75ca25 Add changelog for v2.4.0
• d528e8f Add information on Message.poll for Message Content Intent
• c055fd3 Fix ui.Button providing a custom_id for premium buttons
• be9edf8 Remove setting sku_id explicitly via button decorator
• 9eac365 Allow deletion race conditions to work with purge
• fb12d3d Remove unnecessary warning logs for poll events
• 837bc35 Add missing versionadded for a few decorators
• bb1d09a Account for user installations in Channel.permissions_for
• 895d6c3 Add Permissions.use_external_apps
• Additional commits viewable in compare view

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