fix(openapi): yaml openapi export should have numeric keys as string (#6436)

Author: DartCZ

src/OpenApi/Command/OpenApiCommand.php

@@ -57,7 +57,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
  'spec_version' => $input->getOption('spec-version'),
  ]);
  $content = $input->getOption('yaml')
- ? Yaml::dump($data, 10, 2, Yaml::DUMP_OBJECT_AS_MAP | Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE | Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK)
+ ? Yaml::dump($data, 10, 2, Yaml::DUMP_OBJECT_AS_MAP | Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE | Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK | Yaml::DUMP_NUMERIC_KEY_AS_STRING)
  : (json_encode($data, \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES) ?: '');
 
  $filename = $input->getOption('output');