* fix(binding): support application/yaml
RFC 9512 defines application/yaml as the official YAML MIME type.
application/x-yaml is deprecated. In this commit, we ensure it is
recognized correctly in Content-Type.
* fix(render): use application/yaml when rendering YAML
As per RFC 9512, application/x-yaml is now deprecated and applications
should use application/yaml. This commit fix the Content-Type header
when rendering YAML.
