Allow guzzlehttp/psr7 version 2.x as composer dependency

[maecompany]

Currently "guzzlehttp/psr7" is locked to the ^1.4 version range in composer.json.

This is blocking us from upgrading our stack, because several other dependencies (for example codeception/module-rest) now require guzzlehttp/psr7 versions 2.x and up.

Would it be possible to add support for the 2.x range by changing "guzzlehttp/psr7": "^1.4" to "guzzlehttp/psr7": "^1.4 || ^2.0"?

The only change needed is updating this line to:
$queryParams = \GuzzleHttp\Psr7\Query::parse($request->getUri()->getQuery());

[her-ur]

Hi @mbonneau, we would also appreciate to do this update, because dependencies update. Here is MR: #5
Thank you very much!

[zarv1k]

I'm using PHP 8.2 and there is deprecation warning like the following in guzzlehttp/psr7 1.7:

Deprecated: Creation of dynamic property GuzzleHttp\Psr7\CachingStream::$stream is deprecated

It's already fixed in guzzlehttp/psr7 since 2.4.0, but I can't update guzzlehttp/psr7 to 2.x, coz thruway/ratchet-transport locked with "guzzlehttp/psr7": "^1.4"
So would be really great if the thruway/ratchet-transport supported guzzlehttp/psr7 2.x.

@mbonneau could you please review merge the #5?