[fix] Fix delete http verb (the k6 equivalent is del) (#6624)

Author: mostafa

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/K6ClientCodegen.java

@@ -143,7 +143,8 @@ static class HTTPRequest {
 
         public HTTPRequest(String method, String path, @Nullable List<Parameter> query, @Nullable HTTPBody body,
                            @Nullable HTTPParameters params, @Nullable List<k6Check> k6Checks) {
-            this.method = method;
+            // NOTE: https://k6.io/docs/javascript-api/k6-http/del-url-body-params
+            this.method = method.equals("delete") ? "del" : method;
             this.path = path;
             this.query = query;
             this.body = body;

samples/client/petstore/k6/.openapi-generator/VERSION

@@ -1 +1 @@
-4.3.0-SNAPSHOT
+5.0.0-SNAPSHOT

samples/client/petstore/k6/script.js

@@ -1,13 +1,13 @@
 /*
  * OpenAPI Petstore
- * This is a sample server Petstore server.  For this sample, you can use the api key \"special-key\" to test the authorization filters
+ * This is a sample server Petstore server. For this sample, you can use the api key \"special-key\" to test the authorization filters
  *
  * OpenAPI spec version: 1.0.0
  *
  * NOTE: This class is auto generated by OpenAPI Generator.
  * https://github.com/OpenAPITools/openapi-generator
  *
- * OpenAPI generator version: 4.3.0-SNAPSHOT
+ * OpenAPI generator version: 5.0.0-SNAPSHOT
  */
 
 
@@ -77,7 +77,7 @@ export default function() {
 
         // Request No. 3
         params = {headers: {"api_key": `${apiKey}`}};
-        request = http.delete(url, params);
+        request = http.del(url, params);
         sleep(SLEEP_DURATION);
     });
     group("/pet/{petId}/uploadImage", () => {
@@ -125,7 +125,7 @@ export default function() {
         sleep(SLEEP_DURATION);
 
         // Request No. 2
-        request = http.delete(url);
+        request = http.del(url);
         sleep(SLEEP_DURATION);
     });
     group("/user", () => {
@@ -198,7 +198,7 @@ export default function() {
         sleep(SLEEP_DURATION);
 
         // Request No. 3
-        request = http.delete(url);
+        request = http.del(url);
         sleep(SLEEP_DURATION);
     });
 }