Promise 3.x compatibility

[ProCycleDev]

This project can be marked as compatible with react/promise 3.x and 2.x by addressing a depreciation with FulfilledPromise and RejectedPromise classes.

These internal classes were marked as depreciated in 2.8.0 and to be removed in 3.0.0.
They are the only depreciated pieces of code that was removed in 3.0.0.

These changes have been tested with the latest version of opensearch-project/opensearch-php on PHP 8.1

[stof]

As FutureInterface extends PromiseInterface which has additional methods in 3.x, this should probably be a new major version (supporting only 3.x) so that the signature of FutureInterface for a given version of ringphp does not depend on the installed version of react/promise.

And implementations of FutureInterface need to be updated to implement the new methods as well.

These changes have been tested with the latest version of opensearch-project/opensearch-php on PHP 8.1

have you actually checked that your tests were using react/promise 3.x ? This is weird as the behavior would have been a fatal error normally

[ProCycleDev]

Yep you're right it was still 2.x
Broken on 3.x

I'm very confused because PromisorInterface is gone in 3.x but there is no mention at all about depreciation of it in the 2.x or 3.x changelog

[ProCycleDev]

Closing this PR as I do not have the skill to fix this for 3.x