Support for PHP 8.1 and 8.2

[Sweetchuck]

Deprecated: Return type of cebe\openapi\spec\Responses::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /.../cebe/php-openapi/src/spec/Responses.php on line 229

• cebe\openapi\spec\Paths::offsetExists($offset)
• cebe\openapi\spec\Paths::offsetGet($offset)
• cebe\openapi\spec\Paths::offsetSet($offset, $value)
• cebe\openapi\spec\Paths::offsetUnset($offset)
• cebe\openapi\spec\Paths::count()
• cebe\openapi\spec\Paths::getIterator()
• cebe\openapi\spec\Responses::offsetExists($offset)
• cebe\openapi\spec\Responses::offsetGet($offset)
• cebe\openapi\spec\Responses::offsetSet($offset, $value)
• cebe\openapi\spec\Responses::offsetUnset($offset)
• cebe\openapi\spec\Responses::count()
• cebe\openapi\spec\Responses::getIterator()

[Sweetchuck]

• [openapi v3.1] PHP 8.2 deprecations #178