fix: adds region from env var to config

[sudolibre]

This PR is to fix the issue when you set the OKTA_AWSCLI_AWS_REGION via env var the region does not get saved in the profile. If we add the env var value to config here it gets saved as expected.

[monde]

Thanks @sudolibre this will go out in the next release.

[monde]

@sudolibre we have merge protections on all commits being signed. Can you update your PR with signed commits?

• Set up: https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits
• Rewriting old commits with your new signature: https://superuser.com/questions/397149/can-you-gpg-sign-old-commits