Bump spin from 0.9.3 to 0.9.8

Bumps [spin](https://github.com/mvdnes/spin-rs) from 0.9.3 to 0.9.8.
- [Release notes](https://github.com/mvdnes/spin-rs/releases)
- [Changelog](https://github.com/mvdnes/spin-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mvdnes/spin-rs/commits)

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

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