Update clap requirement from 3.1.18 to 4.2.1

[dependabot[bot]]

Updates the requirements on clap to permit the latest version.

Release notes

Sourced from clap's releases.

v4.2.1

[4.2.1] - 2023-03-28

Fixes

• Don't highlight uninteresting parts of the error message

Changelog

Sourced from clap's changelog.

[4.2.1] - 2023-03-28

Fixes

• Don't highlight uninteresting parts of the error message

[4.2.0] - 2023-03-28

Compatibility

• Removed the languishing unstable-replace feature (open to discussion at #2836)
• Removed the stablized unstable-grouped feature

Features

• Allow any StyledStr to accept text styled with ANSI escape codes
• Respect CLICOLOR, CLICOLOR_FORCE

Fixes

• Lighten the tone for "unexpected argument" errors (open to discussion at #4638)

[4.1.14] - 2023-03-28

Features

• (derive) #[group] raw attribute support

Performance

• (derive) clap_builder was pulled out of clap so it could build in parallel to clap_derive
• os_str_bytes dependency was removed for faster builds and smaller binaries

[4.1.13] - 2023-03-18

Performance

• Reduce repeated alloc calls when building a Command
• Reduce duplicate dependencies for faster builds

[4.1.12] - 2023-03-18

Internal

• (derive) Update to syn v2

Performance

• (derive) Faster build times by dropping proc-macro-error dependency

... (truncated)

Commits

• 3ef784b chore: Release
• 6e1b659 Merge pull request #4810 from epage/fixx
• 58615a1 fix(error): Don't highlight 'similar'
• 8f45d2f docs(derive): Reword opt-out
• 06d1907 docs(derive): Clarify opt-out of special type behavior
• 8fc65e2 chore: Release
• 21be636 docs: Update changelog
• 4ed6ddb Merge pull request #4805 from epage/replace
• 79be4bd chore: Release
• 47b397d docs: Update changelog
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like clap is no longer updatable, so this is no longer needed.