build(deps): bump tokio-stream from 0.1.7 to 0.1.8 (#953)

Bumps [tokio-stream](https://github.com/tokio-rs/tokio) from 0.1.7 to 0.1.8.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-stream-0.1.7...tokio-stream-0.1.8)

---
updated-dependencies:
- dependency-name: tokio-stream
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

helix-lsp/Cargo.toml

@@ -24,4 +24,4 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 thiserror = "1.0"
 tokio = { version = "1.13", features = ["rt", "rt-multi-thread", "io-util", "io-std", "time", "process", "macros", "fs", "parking_lot"] }
-tokio-stream = "0.1.7"
+tokio-stream = "0.1.8"