Update aws-smithy-client requirement from 0.55 to 0.60 in /oktaws

Updates the requirements on [aws-smithy-client](https://github.com/smithy-lang/smithy-rs) to permit the latest version.
- [Release notes](https://github.com/smithy-lang/smithy-rs/releases)
- [Changelog](https://github.com/smithy-lang/smithy-rs/blob/main/CHANGELOG.md)
- [Commits](https://github.com/smithy-lang/smithy-rs/commits)

---
updated-dependencies:
- dependency-name: aws-smithy-client
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

oktaws/Cargo.toml

@@ -52,7 +52,7 @@ aws-smithy-types = "0.55.3"
 aws-config = { path = "../aws-config", default_features = false }
 
 [dev-dependencies]
-aws-smithy-client = { version = "0.55", features = ["test-util"] }
+aws-smithy-client = { version = "0.60", features = ["test-util"] }
 aws-smithy-http = "0.55"
 http = "0.2"
 serial_test = "2"