fix(py) add new line after partial_api include

Otherwise formatting failed because the response_data... line started
in the same line as the last char from partial_api. Compare with
upstream: https://github.com/OpenAPITools/openapi-generator/blob/342febde58e655953a697320f30dd1febdf09ef5/modules/openapi-generator/src/main/resources/python/api.mustache#L36

Author: cgoetz-inovex

languages/python/templates/api.mustache

@@ -35,6 +35,7 @@ class {{classname}}:
     @validate_call
     {{#asyncio}}async {{/asyncio}}def {{operationId}}{{>partial_api_args}} -> {{{returnType}}}{{^returnType}}None{{/returnType}}:
 {{>partial_api}}
+
         response_data = {{#asyncio}}await {{/asyncio}}self.api_client.call_api(
             *_param,
             _request_timeout=_request_timeout
@@ -49,6 +50,7 @@ class {{classname}}:
     @validate_call
     {{#asyncio}}async {{/asyncio}}def {{operationId}}_with_http_info{{>partial_api_args}} -> ApiResponse[{{{returnType}}}{{^returnType}}None{{/returnType}}]:
 {{>partial_api}}
+
         response_data = {{#asyncio}}await {{/asyncio}}self.api_client.call_api(
             *_param,
             _request_timeout=_request_timeout
@@ -63,6 +65,7 @@ class {{classname}}:
     @validate_call
     {{#asyncio}}async {{/asyncio}}def {{operationId}}_without_preload_content{{>partial_api_args}} -> RESTResponseType:
 {{>partial_api}}
+
         response_data = {{#asyncio}}await {{/asyncio}}self.api_client.call_api(
             *_param,
             _request_timeout=_request_timeout