Support for PHP 8.1

[iwiznia]

The latest version of PHP is 8.1 and this package does not support it.

I forced it to install to see if it would work, but seems that at least all the classes that implement jsonSerializable need to be updated to add a return type.

An example of the error is:

PHP Fatal error: During inheritance of JsonSerializable: Uncaught ErrorException: Return type of ChromeDevtoolsProtocol\Model\Target\CreateBrowserContextRequest::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /chrome-devtools-protocol/gen-src/ChromeDevtoolsProtocol/Model/Target/CreateBrowserContextRequest.php:52

There's also some deprecations like:

PHP Deprecated:  Return type of ChromeDevtoolsProtocol\Model\Network\Headers::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in chrome-devtools-protocol/gen-src/ChromeDevtoolsProtocol/Model/Network/Headers.php on line 75