:bug: Inherit input and error streams for password command
:bug: Inherit input and error streams for password command

- After setting up `OKTA_PASSWORD_CMD` to use
  `lpass show --password okta.com`, I noticed that if the LastPass CLI
  needed to reprompt for my LastPass master password, it was failing and
  the Okta AWS CLI was swallowing any error messages.
- Inheriting the error stream means that the password command's error
  message will actually show up and inheriting the input stream allows
  the password command to prompt for anything it needs such as the
  LastPass CLI. This leaves standard output as a pipe since that is what
  is used to retrieve the password as usual.

oktadeveloper/okta-aws-cli-assume-role,oktadeveloper/okta-aws-cli-assume-role,oktadeveloper/okta-aws-cli-assume-role