dispose cts after call finish (#1128)

Author: tg123

src/LibKubernetesGenerator/templates/Operations.cs.template

@@ -7,7 +7,7 @@
 namespace k8s;
 
 public partial class AbstractKubernetes : I{{name}}Operations
-{
+{
     {{#apis}}
     /// <inheritdoc/>
     async Task<HttpOperationResponse{{GetReturnType operation "<>"}}> I{{name}}Operations.{{GetMethodName operation "WithHttpMessagesAsync"}}(
@@ -17,7 +17,7 @@ public partial class AbstractKubernetes : I{{name}}Operations
         IReadOnlyDictionary<string, IReadOnlyList<string>> customHeaders,
         CancellationToken cancellationToken)
     {
-        var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
+        using var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
         cts.CancelAfter(HttpClientTimeout);
         {{#IfParamContains operation "watch"}}
         if (watch == true)
@@ -58,13 +58,13 @@ public partial class AbstractKubernetes : I{{name}}Operations
         {{#IfParamDoesNotContain operation "body"}}
         var httpResponse = await SendRequest<object>(url, HttpMethods.{{Method}}, customHeaders, null, cancellationToken);
         {{/IfParamDoesNotContain operation "body"}}
-        // Create Result
+        // Create Result
         var httpRequest = httpResponse.RequestMessage;
         {{#IfReturnType operation "void"}}
         HttpOperationResponse result = new HttpOperationResponse() { Request = httpRequest, Response =  httpResponse };
         {{/IfReturnType operation "void"}}
         {{#IfReturnType operation "obj"}}
-        var result = await CreateResultAsync{{GetReturnType operation "<>"}}(
+        var result = await CreateResultAsync{{GetReturnType operation "<>"}}(
             httpRequest,
             httpResponse,
             {{#IfParamContains operation "watch"}}