build(deps): bump rustix from 0.38.17 to 0.38.21 in /soundcore-lib

Bumps [rustix](https://github.com/bytecodealliance/rustix) from 0.38.17 to 0.38.21.
- [Release notes](https://github.com/bytecodealliance/rustix/releases)
- [Commits](bytecodealliance/rustix@v0.38.17...v0.38.21)

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

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