chore(deps): update signal-hook requirement from 0.3 to 0.4

[dependabot]

Updates the requirements on signal-hook to permit the latest version.

Changelog

Sourced from signal-hook's changelog.

0.4.4

• Documentation about SIGBUS (#204).

0.4.3

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

0.4.2

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

signal-hook-mio-0.3.0

signal-hook-tokio-0.4.0

signal-hook-async-std-0.4.0

• Release to bump dependency on signal-hook.

0.4.1

• Don't pin specific dependency versions accidentally.

0.4.0

• Changed the low_level::pipe to look OwnedFd instead of IntoRawFd, to enforce ownership of the file descriptor (#196).

signal-hook-registry-1.4.8

• Restore errno on signal handler exit (#194, #191).

signal-hook-registry-1.4.7

• Using earlier monopolization to reduce binary size (#190).

signal-hook-mio-0.2.5

• Allow mio 1.1

signal-hook-registry-1.4.6

• Reword/improve the safety requirements docs for register (#178).

signal-hook-1.3.18

• Release the special-case removal of AIX for top-level signal-hook too (#169, #176).

signal-hook-async-std-0.3.0

... (truncated)

Commits

• f37a7b5 Document SIGBUS
• b089b6b Update deps
• 7854fb6 Don't exclude .c files from release package
• c81b0e0 Release version 0.4.2
• 390dafb Fix double-close on pipe unregister
• 173107a Exclude development script from published package
• 2413101 Release async crates
• 85f8c75 Version 0.4.1 (don't pin dep versions)
• 6e44722 Version bump to 0.4.0
• 80cc0cf Update dependencies
• Additional commits viewable in compare view

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