Update Rust crate signal-hook to v0.4.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
signal-hook	dependencies	patch	0.4.4 → 0.4.5

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Release Notes

vorner/signal-hook (signal-hook)

v0.4.5

Compare Source

• 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.

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-10-09 17:55 UTC · Rule: dependency-updates · triggered by merge protections
• ✅ Checks passed · on draft merge queue: checking #44 + #43 + #42 together on main (2805a84) #45
• ✅ Merged — 2026-10-09 18:07 UTC · at ebd1839538adbf2d52116d6fe453ee7460187357 · merge-batch via merge queue: checking #44 + #43 + #42 together on main (2805a84) #45

This pull request spent 12 minutes 29 seconds in the queue, including 1 minute 41 seconds running CI.

Required conditions to merge

• #approved-reviews-by >= 1
  • Update Rust crate libc to v0.2.190 #42
  • Update Rust crate signal-hook to v0.4.5 #43
  • Lockfile maintenance #44
• github-review-approved [🛡 GitHub repository ruleset rule main]
  • Update Rust crate libc to v0.2.190 #42
  • Update Rust crate signal-hook to v0.4.5 #43
  • Lockfile maintenance #44
• any of [🛡 GitHub repository ruleset rule main]:
  • check-success = @github-actions/Test
  • check-neutral = @github-actions/Test
  • check-skipped = @github-actions/Test