chore(deps): update rust crate signal-hook to v0.4.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
signal-hook	workspace.dependencies	patch	0.4.1 → 0.4.2

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Release Notes

vorner/signal-hook (signal-hook)

v0.4.2

• Fix double-close on pipe unregister (#​200).
• Don't include development scripts in release package (195).

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[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tty/tty-eof (passes in this run but fails in the 'main' branch)