Replace API client with composer package

Not compatible with the latest Drupal 9 version, (9.5.2).

Upon running composer why guzzlehttp/guzzle I spotted the culprit

Aah, dependency management. I've just checked, their earliest version of the API library is from May 2021, and they never supported any lower Guzzle versions. That means, we can use this only on Drupal 10 and beyond. Glad I had also decided to start with semantic versioning and put this into the 4.0.x branch, so we can declare this for Drupal 10+ only. Drupal 9 users will then have to live with the 8.x-3.x branch for the final few months of Drupal 9's lifecycle.

I have updated the dependencies in the info file and in composer.json - the good thing about this is that we can now also make PHP 8.1 a requirement, which allows us to clean up the code even further and make it even more modern.

I totally agree, lets be modern! :)

Excellent, glad we go that route. Will be creating a beta release for this when the remaining issue(s) resolved and make a note on the project page, why this is for D10 only.

Automatically closed - issue fixed for 2 weeks with no activity.