Bump aws-config from 1.5.5 to 1.5.6 (#664)

Bumps [aws-config](https://github.com/smithy-lang/smithy-rs) from 1.5.5 to 1.5.6.
- [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-config
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.toml

@@ -145,7 +145,7 @@ wasmtime-wasi = "24.0.0"
 [dev-dependencies]
 assert_cmd = "2"
 assert_unordered = "0.3"
-aws-config = { version = "1.0.1", features = ["behavior-version-latest"] }
+aws-config = { version = "1.5.6", features = ["behavior-version-latest"] }
 aws-credential-types = { version = "1.2.1", features = ["hardcoded-credentials"] }
 aws-sdk-sts = { version = "1.41.0", features = ["behavior-version-latest"] }
 rstest = "*"