fix: rename headers in server sdk

Author: loks0n

templates/dart/base/requests/api.twig

@@ -4,10 +4,10 @@
             {{ utils.map_parameter(method.parameters.body) }}
         };
 
-        final Map<String, String> headers = {
+        final Map<String, String> apiHeaders = {
             {{ utils.map_headers(method.headers) }}
         };
 
-        final res = await client.call(HttpMethod.{{ method.method | caseLower }}, path: apiPath, params: params, headers: headers);
+        final res = await client.call(HttpMethod.{{ method.method | caseLower }}, path: apiPath, params: params, headers: apiHeaders);
 
         return {% if method.responseModel and method.responseModel != 'any' %}models.{{method.responseModel | caseUcfirst | overrideIdentifier}}.fromMap(res.data){% else %} res.data{% endif %};

templates/dart/base/requests/file.twig

@@ -4,7 +4,7 @@
             {{ utils.map_parameter(method.parameters.body) }}
         };
 
-        final Map<String, String> headers = {
+        final Map<String, String> apiHeaders = {
             {{ utils.map_headers(method.headers) }}
         };
 
@@ -23,7 +23,7 @@
             params: params,
             paramName: paramName,
             idParamName: idParamName,
-            headers: headers,
+            headers: apiHeaders,
             onProgress: onProgress,
         );