Bump ws from 0.8.0 to 0.8.1 (#4251)

Bumps [ws](https://github.com/housleyjk/ws-rs) from 0.8.0 to 0.8.1.
- [Release notes](https://github.com/housleyjk/ws-rs/releases)
- [Changelog](https://github.com/housleyjk/ws-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/housleyjk/ws-rs/compare/v0.8.0...v0.8.1)

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

bench-exchange/Cargo.toml

@@ -32,7 +32,7 @@ solana-metrics = { path = "../metrics", version = "0.15.0"  }
 solana-netutil = { path = "../netutil", version = "0.15.0"  }
 solana-runtime = { path = "../runtime", version = "0.15.0"  }
 solana-sdk = { path = "../sdk", version = "0.15.0"  }
-ws = "0.8.0"
+ws = "0.8.1"
 untrusted = "0.6.2"
 
 [features]