Documentation shows support for 1.29, but Makefile does not have a reference for 1.29

[awsjake]

Add to Makefile:

.PHONY: 1.29
1.29: ## Build EKS Optimized RHEL AMI - K8s 1.29
	$(MAKE) k8s $(shell hack/latest-binaries.sh 1.29)

This has been tested. Should I create a branch and PR?

[awsjake]

Another suggestion:

In eks-worker-rhel-variables.json, var 'cni_plugin_version' should be updated to latest 'v1.4.1'.

In README.md, another Note should be added to match the AWS Blog note similar to the following:

> **Note**
> There is a network routing issue caused by the nm-cloud-setup service that comes preinstalled on RHEL machines. In the AWS [Blog](https://aws.amazon.com/blogs/containers/run-amazon-eks-on-rhel-worker-nodes-with-ipvs-networking), we demonstrate how to disable this service and reboot the EC2 instances as recommended by Red Hat in the following KB [article](https://access.redhat.com/solutions/6319811).

[bradwatsonaws]

Sure @awsjake feel free to submit a PR for these.

[bradwatsonaws]

Hey @awsjake - I added the note to the readme regarding the nm-cloud-setup service.

Regarding the 1.29 k8s variable - hard coding k8s versions has been deprecated to keep in sync with the upstream awslabs repo. Specific versions should be specified using the k8s variable moving forward.

Example:
make k8s=1.29