Update mio requirement from 0.8 to 1.0

Updates the requirements on [mio](https://github.com/tokio-rs/mio) to permit the latest version.
- [Release notes](https://github.com/tokio-rs/mio/releases)
- [Changelog](https://github.com/tokio-rs/mio/blob/master/CHANGELOG.md)
- [Commits](tokio-rs/mio@v0.8.0...v1.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

metrics-exporter-tcp/Cargo.toml

@@ -22,7 +22,7 @@ bytes = { version = "1", default-features = false }
 crossbeam-channel = { version = "0.5", default-features = false, features = ["std"] }
 prost = { version = "0.12", default-features = false }
 prost-types = { version = "0.12", default-features = false, features = ["std"] }
-mio = { version = "0.8", default-features = false, features = ["os-poll", "net"] }
+mio = { version = "1.0", default-features = false, features = ["os-poll", "net"] }
 tracing = { version = "0.1", default-features = false, features = ["attributes"] }
 
 [build-dependencies]