Bump aws-credential-types from 1.2.0 to 1.2.1 (#452)

Bumps [aws-credential-types](https://github.com/smithy-lang/smithy-rs) from 1.2.0 to 1.2.1.
- [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-credential-types
  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

@@ -14,7 +14,7 @@ actix-web = { version = "4.9.0" }
 actix-web-httpauth = { version = "0.8.2" }
 async-trait = { version = "0.1.81" }
 aws-config = { version = "1.5.5", features = ["behavior-version-latest"] }
-aws-credential-types = { version = "1.1.8", features = ["hardcoded-credentials"] }
+aws-credential-types = { version = "1.2.1", features = ["hardcoded-credentials"] }
 aws-sdk-s3 = { version = "1.43.0" }
 aws-smithy-types-convert = { version = "0.60.8", features = ["convert-chrono"] }
 aws-types = { version = "1.3.0" }