add pyyaml.dump(..., sort_keys=False) to not sort openapi keys alphabetically

Author: n2ygk

requirements/requirements-optionals.txt

@@ -5,4 +5,4 @@ django-guardian==1.5.0
 django-filter>=2.1.0, <2.2
 coreapi==2.3.1
 coreschema==0.0.4
-pyyaml
+pyyaml>=5.1

rest_framework/renderers.py

@@ -1049,7 +1049,7 @@ def __init__(self):
         assert yaml, 'Using OpenAPIRenderer, but `pyyaml` is not installed.'
 
     def render(self, data, media_type=None, renderer_context=None):
-        return yaml.dump(data, default_flow_style=False).encode('utf-8')
+        return yaml.dump(data, default_flow_style=False, sort_keys=False).encode('utf-8')
 
 
 class JSONOpenAPIRenderer(BaseRenderer):