Bump rustix from 0.37.19 to 0.37.25 in /examples/rust/builtin_echo

Bumps [rustix](https://github.com/bytecodealliance/rustix) from 0.37.19 to 0.37.25.
- [Release notes](https://github.com/bytecodealliance/rustix/releases)
- [Commits](bytecodealliance/rustix@v0.37.19...v0.37.25)

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

Signed-off-by: dependabot[bot] <support@github.com>