Bump which from 4.2.2 to 4.2.4

Created by: dependabot[bot]

Bumps which from 4.2.2 to 4.2.4.

Commits

• 8fbe342 bump version to 4.2.4
• 956d3ae Merge pull request #50 from Xiaobin0860/win
• d7c42c7 Fix windows compilation error.
• 6532c31 bump version to 4.2.3
• 4b0ab8c fix #46 removed current directory error
• 6765276 fix #47 Pathext parsing error
• e63fe6f fix code format
• 49766c8 Merge pull request #45 from mverleg/regex_doc
• da2cc66 Add feature requirements and example to which_re documentation
• f237980 Show regex-features in the documentation
• Additional commits viewable in compare view

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