Bump twilight-util from 0.14.1 to 0.15.4

[dependabot[bot]]

Bumps twilight-util from 0.14.1 to 0.15.4.

Release notes

Sourced from twilight-util's releases.

util: 0.15.0

Features

• [breaking] flatten CommandOptionChoice (#2081)

Refactor

• [breaking] clean up AllowedMentions (#1869)

util: 0.14.2

Features

• add role subscriptions (#2034)

Commits

• eb367a9 release({{crate_name}}): bump to {{version}}
• 76845ed release: generate changelogs
• bc2c66e fix(model): Re-export OnboardingPromptEmoji
• a085bed release({{crate_name}}): bump to {{version}}
• ccdc57e release: generate changelogs
• 1a8fb4e fix(http): fix get invite query params (#2256)
• fd2ad69 fix(model): add VanityUrl uses (#2257)
• 5868426 docs(http): fix Client::delete_messages (#2252)
• 8ac75f9 docs(http): add limit to guild members request (#2254)
• de5725d fix(gateway): defer queued commands until sent Resume (#2264)
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot show ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.