build(deps): bump redox_syscall from 0.5.17 to 0.5.18

Bumps redox_syscall from 0.5.17 to 0.5.18.

---
updated-dependencies:
- dependency-name: redox_syscall
  dependency-version: 0.5.18
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]