Bump the patch-updates group in /rust with 6 updates (#518)

Bumps the patch-updates group in /rust with 6 updates:

| Package | From | To |
| --- | --- | --- |
| [libc](https://github.com/rust-lang/libc) | `0.2.156` | `0.2.158` |
| redox_syscall | `0.5.2` | `0.5.3` |
| redox_users | `0.4.5` | `0.4.6` |
| [syn](https://github.com/dtolnay/syn) | `2.0.74` | `2.0.75` |
| [tokio](https://github.com/tokio-rs/tokio) | `1.39.2` | `1.39.3` |
| [unicode-xid](https://github.com/unicode-rs/unicode-xid) | `0.2.4` | `0.2.5` |


Updates `libc` from 0.2.156 to 0.2.158
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Changelog](https://github.com/rust-lang/libc/blob/0.2.158/CHANGELOG.md)
- [Commits](rust-lang/libc@0.2.156...0.2.158)

Updates `redox_syscall` from 0.5.2 to 0.5.3

Updates `redox_users` from 0.4.5 to 0.4.6

Updates `syn` from 2.0.74 to 2.0.75
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.74...2.0.75)

Updates `tokio` from 1.39.2 to 1.39.3
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.39.2...tokio-1.39.3)

Updates `unicode-xid` from 0.2.4 to 0.2.5
- [Commits](unicode-rs/unicode-xid@v0.2.4...v0.2.5)

---
updated-dependencies:
- dependency-name: libc
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: patch-updates
- dependency-name: redox_syscall
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: patch-updates
- dependency-name: redox_users
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: patch-updates
- dependency-name: syn
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: patch-updates
- dependency-name: tokio
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: patch-updates
- dependency-name: unicode-xid
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: patch-updates
...

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