Is your feature request related to a problem? Please describe.
AWS's Go SDK version v1.37.0 added support for AWS SSO-based credentials (aws/aws-sdk-go#3755).
Not having this prevents from downstream dependencies of go-cloud (like pulumi) from using awskms:/// in environments where AWS SSO-based credentials are used.
Describe the solution you'd like
Bump version of aws-sdk-go from v1.36.1 to v1.37.0 (or newer)
Describe alternatives you've considered
A potential workaround is to use a tool like yawsso to "manufacture" non-SSO based credentials (as found in ~/.aws/credentials), but these are short-lived and prone to expiration.
Additional context
Happy to contribute a PR with the version bump - but I'm not certain what kind of testing would need to be done other than bumping the version.