Drupal 10 compatibility

Hi @bdimaggio,
I have fixed this issue Drupal 10 compatibility and also attached patch .
please review and verify.

Hi, @sarwan.
If not needed, the commented line of code should be deleted.

Hi @paulrad,
As your request, I have modified patch & attached.

Thanks for this, @sarwan! One other tweak: is the use statement for GuzzleHttp\Client in src/Rest/Gateway.php necessary?

Hi @bdimaggio the use use GuzzleHttp\Utils is dependent on GuzzleHttp\Client so you have to use that as well.

Hmm... could you point to some documentation for that? I've just tested Gateway->post() without that GuzzleHttp\Client use statement, and it worked without PHP errors (or even notices).