In Laravel version > 9 we have to use guzzlehttp with minimum version : 7.
In the dev-master branch of this project, guzzlehttp is specified for version ^6 .

I have installed the project in local, upadte guzzlehttp version and all seems ok.

We have just to change the guzzlehttp version of composer.json file, and all people who want use this package in laravel project or other will can install it..