build(deps): Bump cyclopts from 4.20.0 to 4.21.0

[dependabot]

Bumps cyclopts from 4.20.0 to 4.21.0.

Release notes

Sourced from cyclopts's releases.

v4.21.0

Feature

• Add Parameter.negative_alias to append extra names to a flag's negative form (e.g. a short -d) without dropping the generated --no-*/--empty-* names. Mirrors name/alias. By @​BrianPugh in BrianPugh/cyclopts#859

Bug Fixes

• Fix [#857](https://github.com/BrianPugh/cyclopts/issues/857): a dataclass command with a default_factory field could raise a spurious "Input should be a valid list" validation error simply because pydantic was imported anywhere in the program. Factory defaults are now invoked during introspection, so the produced value (rather than the <factory> sentinel) is used as the default and shown in help text — consistent across dataclass, attrs, and pydantic. By @​BrianPugh in BrianPugh/cyclopts#858

Full Changelog: BrianPugh/cyclopts@v4.20.0...v4.21.0

Commits

• 19ed511 Merge pull request #858 from BrianPugh/issue-857-pydantic-dataclass-default-f...
• 0e4203e Add regression test for attrs takes_self factory default
• 23b8179 Merge pull request #859 from BrianPugh/negative-alias
• 821efec Add Parameter.negative_alias
• 10491b1 Invoke zero-arg pydantic default_factory during introspection
• 4d04724 DRY up sentinel-default resolution in signature_parameters
• dfd4110 Don't re-register fields when accepts_keys=True is explicit
• f2eb9de Resolve pydantic default_factory sentinel in signature_parameters
• 196467d Resolve attrs Factory defaults in _attrs_field_infos
• 0ae04ae Resolve attrs Factory sentinel in signature_parameters
• 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 show <dependency name> 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)