[ISSUE-10323]: Adjust api.mustache to support deprecated REST endpoints for Dart as well.

Author: mway-dmueller

modules/swagger-codegen/src/main/resources/dart/api.mustache

@@ -12,6 +12,9 @@ class {{classname}} {
   /// {{summary}}
   ///
   /// {{notes}}
+  {{#isDeprecated}}
+  @deprecated
+  {{/isDeprecated}}
   {{#returnType}}Future<{{{returnType}}}> {{/returnType}}{{^returnType}}Future {{/returnType}}{{nickname}}({{#allParams}}{{#required}}{{{dataType}}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/required}}{{/allParams}}{{#hasOptionalParams}}{ {{#allParams}}{{^required}}{{{dataType}}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/required}}{{/allParams}} }{{/hasOptionalParams}}) async {
     Object postBody = {{#bodyParam}}{{paramName}}{{/bodyParam}}{{^bodyParam}}null{{/bodyParam}};