Update Rust crate poise to 0.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
poise	dependencies	minor	0.5 -> 0.6

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Release Notes

serenity-rs/poise (poise)

v0.6.1

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New features:

• Choice parameters can now be defined inline in a function signature (6167311)

  For example:

  #[choices("Europe", "Asia", "Africa", "America", "Australia", "Antarctica")]
  continent: &'static str

Detailed changelog: serenity-rs/poise@v0.6.0...v0.6.1

Thanks to @​kangalio!

v0.6.0

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Now with serenity 0.12!

New features:

• ChoiceParameter is now not only a derive macro, but also a trait, so you can implement it manually (bc250b8)
• HelpConfiguration::include_description can be used to toggle whether a single command's help output includes its description, or only its help_text (0ad8ee6)

API updates:

• A lot of structs and enum are now #[non_exhaustive] to allow backwards compatible new features in the future (035e035, 6c08cfb, 1cbfeef)
• Command no longer has Default bounds on its generics (695ae1d)
• Changed some field types on Command to be more idiomatic (6c08cfb)
• CooldownTracker methods now take a dedicated user-constructable CooldownContext instead of Context<'_, U, E>, to make CooldownTracker usable outside poise internals (bd73861)

Behavior changes:

• Rework of the help command to make it nicer (d38d226, d038ee6)

Detailed changelog: serenity-rs/poise@v0.5.7...v0.6.0

Thanks to @​kangalio, @​docwilco, @​drwilco, @​GnomedDev, @​scottbot95!

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