Update Rust crate signal-hook to 0.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
signal-hook	dependencies	minor	0.3.17 → 0.4.0

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Release Notes

vorner/signal-hook (signal-hook)

v0.4.5

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• pipe::register_raw now really sets close-on-exec (FD_CLOEXEC) on the file descriptor, for
  both pipes and sockets (#​206).
• Removed the 32-bit Android sigemptyset/sigaddset fallback, which panicked in
  emulate_default_handler (#​207). Android below API 21 is no longer supported.

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

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