Bump tokio from 1.5.1 to 1.8.4 (#147)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.5.1 to 1.8.4.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.5.1...tokio-1.8.4)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
...

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Cargo.toml

@@ -39,7 +39,7 @@ strum = { version = "~0.24", features = ["derive"] }
 thiserror = "~1.0"
 tempfile = "~3.2"
 cfg-if = "~1.0"
-tokio = { version = "~1.5", features = ["process", "rt-multi-thread"] }
+tokio = { version = "~1.8", features = ["process", "rt-multi-thread"] }
 futures = "~0.3"
 regex = "~1.5"
 semver = "~1.0"