incremented version and addressed header typing issue

Author: squann

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptNestjsClientCodegen.java

@@ -49,7 +49,7 @@ public class TypeScriptNestjsClientCodegen extends AbstractTypeScriptClientCodeg
     public static final String STRING_ENUMS = "stringEnums";
     public static final String STRING_ENUMS_DESC = "Generate string enums instead of objects for enum values.";
 
-    protected String nestVersion = "6.0.0";
+    protected String nestVersion = "9.2.1";
     protected String npmRepository = null;
     protected String serviceSuffix = "Service";
     protected String serviceFileSuffix = ".service";

modules/openapi-generator/src/main/resources/typescript-nestjs/api.service.mustache

@@ -35,7 +35,7 @@ export class {{classname}} {
 {{/withInterfaces}}
 
     protected basePath = '{{{basePath}}}';
-    public defaultHeaders: AxiosRequestHeaders = {};
+    public defaultHeaders: Record<string, string> = {};
     public configuration = new Configuration();
 
     constructor(protected httpClient: HttpService, @Optional() configuration: Configuration) {