Update speedy requirement from 0.6.0 to 0.7.1

Updates the requirements on [speedy](https://github.com/koute/speedy) to permit the latest version.
- [Release notes](https://github.com/koute/speedy/releases)
- [Commits](koute/speedy@0.6.0...0.7.1)

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

Cargo.toml

@@ -15,7 +15,7 @@ bytes = "0.5.4"
 tokio-util = { version = "0.3.1", features = ["codec"] }
 bit-set = { git = "https://github.com/contain-rs/bit-set", rev ="c27082f" }
 bit-vec = "0.6.2"
-speedy = "0.6.0"
+speedy = "0.7.1"
 log = "0.4.8"
 num-traits = "0.2"
 num-derive = "0.3"