Add #[ReturnTypeWillChange] for PHP 8.1 support #35
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In PHP 8.1 the return type of JsonSerializable::jsonSerialize() was added.
To maintain compatibility with older PHP versions the attribute
#[ReturnTypeWillChange] was introduced.
Deprecation warning: Return type of donatj\MockWebServer\RequestInfo::jsonSerialize()
should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the
#[ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
See also: https://wiki.php.net/rfc/internal_method_return_types