Hello,
GitHub - oktadev/okta-aws-cli-assume-role: Okta AWS CLI Assume Role Tool is an older tool that is not officially supported by Okta. I suggest posting this questing directly to its GH issue. According to the repo it does require Java.
If your Okta Org is an OIE Org, the supported AWS CLI is GitHub - okta/okta-aws-cli: A CLI for having Okta as the IdP for AWS CLI operations
Thank You,