Add support for yang-data+json content type

Fix error
```
WARNING parsing GET /restconf/data/ietf-snmp:snmp within ietf_snmp.

Cannot parse response for status code 200 (Unsupported content_type {'application/yang-data+json': MediaType(media_type_schema=Reference(ref='#/components/schemas/get_ietf_snmp_snmp'), example=None, examples=None, encoding=None)}), response will be ommitted from generated client
```
When using SONiC OS REST OpenAPI.

Author: XioNoX

openapi_python_client/parser/responses.py

@@ -25,6 +25,7 @@ class Response:
     "application/json": "response.json()",
     "application/vnd.api+json": "response.json()",
     "application/octet-stream": "response.content",
+    "application/yang-data+json": "response.json()",
     "text/html": "response.text",
 }