deps: update rust crate signal-hook to 0.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
signal-hook	dependencies	minor	0.3 → 0.4

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Release Notes

vorner/signal-hook (signal-hook)

v0.4.4

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• Documentation about SIGBUS (#​204).

v0.4.3

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• Don't exclude .c files from release package.

v0.4.2

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

v0.4.1

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• Don't pin specific dependency versions accidentally.

v0.4.0

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signal-hook-tokio-0.4.0

v0.3.18

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v0.3.17

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• Fix race condition leading into a panic in SignalsInfo::forever (#​148).

v0.3.16

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• Fix compilation on OpenBSD (#​147).

v0.3.15

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0.3.15

v0.3.14

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• Added the SIGINFO signal (where available).

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