Update clap requirement from 2.31.2 to 3.1.12

[dependabot]

Updates the requirements on clap to permit the latest version.

Release notes

Sourced from clap's releases.

v3.1.12

[3.1.12] - 2022-04-22

Fixes

• Regression in 3.1.11 where the (output) streams were crossed

Changelog

Sourced from clap's changelog.

[3.1.12] - 2022-04-22

Fixes

• Regression in 3.1.11 where the (output) streams were crossed

[3.1.11] - 2022-04-22

Fixes

• Implied conflicts override Arg::required, making the behavior consistent with how we calculate conflicts for error reporting
• Members of a mutually exclusive ArgGroup override Arg::required, making the behavior consistent with how we calculate conflicts for error reporting
• Arg::overrides_with always override Arg::required, not just when the parser processes an override

[3.1.10] - 2022-04-19

Features

• Expose Command::build for custom help generation or other command introspection needs

[3.1.9] - 2022-04-15

Fixes

• Pin the clap_derive version so a compatible version is always used with clap

[3.1.8] - 2022-04-01

Fixes

• Add Debug impls to more types

[3.1.7] - 2022-03-31

Fixes

• (derive) Abort, rather than ignore, when deriving ArgEnum with non-unit unskipped variants

[3.1.6] - 2022-03-07

Fixes

• Don't panic when validating delimited defaults (#3541)
• Make it clearer that cargo feature is needed
• Documentation improvements

[3.1.5] - 2022-03-02

Fixes

... (truncated)

Commits

• d805c60 chore: Release
• d09aec2 docs: Update changelog
• 61514bf Merge pull request #3646 from arlosi/fix-stdout
• 854017b fix: Mixup between stderr and stdout introduced in v3.1.11
• a46ee83 chore: Release
• 62e9d2d docs: Update changelog
• 8505c47 refactor(validator): Decouple parser (#3645)
• 9d52301 refactor(validator): Decouple parser
• 6229e78 refactor(parser): Parser is solely responsible for populating ArgMatches
• 02ffd59 refactor(help): Move help writing down a layer
• Additional commits viewable in compare view

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[dependabot]

Superseded by #39.