Bump rustix from 0.37.20 to 0.37.25 in /rust_grpcio_bench (#405)

Bumps [rustix](https://github.com/bytecodealliance/rustix) from 0.37.20 to 0.37.25.
- [Release notes](https://github.com/bytecodealliance/rustix/releases)
- [Commits](bytecodealliance/rustix@v0.37.20...v0.37.25)

---
updated-dependencies:
- dependency-name: rustix
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>