build(deps): bump serde_spanned from 0.6.7 to 0.6.8 (#463)

Bumps [serde_spanned](https://github.com/toml-rs/toml) from 0.6.7 to 0.6.8.
- [Commits](toml-rs/toml@serde_spanned-v0.6.7...serde_spanned-v0.6.8)

---
updated-dependencies:
- dependency-name: serde_spanned
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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