docs(eks): refer to the latest version of supported kubernetes (#23178)

closes #23072
-implemented change proposed in the issue 

----

### All Submissions:

* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md)

### Adding new Construct Runtime Dependencies:

* [ ] This PR adds new construct runtime dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-construct-runtime-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: josephedward

packages/@aws-cdk/aws-eks/README.md

@@ -50,7 +50,8 @@ This example defines an Amazon EKS cluster with the following configuration:
 ```ts
 // provisiong a cluster
 const cluster = new eks.Cluster(this, 'hello-eks', {
-  version: eks.KubernetesVersion.V1_21,
+  version: eks.KubernetesVersion.V1_24,
+  kubectlLayer: new KubectlV24Layer(this, 'kubectl'),
 });
 
 // apply a kubernetes manifest to the cluster