Incompatible with psr/http-message 2

[JshGrn]

Could we get this package updated to be compatible with psr/http-message/2?

[judgej]

Great suggestion. I've got a bit of time today to take a look, and see how far I get. If you have a PR or a fork you can point me to that could help, then we can speed things up.

[judgej]

Release v4.0 now includes the latest psr/http-message, and runs on PHP 8.1 to 8.4

It has had type hints added throughout, and no longer needs a PSR-7 factory. The tests include an integration suite to test against your test account.

Let me know if you encounter any issues. And let me know if this issue can be closed.