feat: Default k3s should be supported

[BrammyS]

Moved the default k3s versions up to an actively supported version

[gemini-code-assist]

Summary of Changes

Hello @BrammyS, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the default K3s versions and related components to more current and actively supported releases. The primary goal is to ensure that new deployments or examples leverage recent Kubernetes versions, improving compatibility and access to the latest features and security patches. This change primarily involves updating version strings in configuration examples and default variable definitions.

Highlights

• K3s Version Updates: The default K3s version examples and channel definitions have been updated to v1.33 across the configuration files.
• Cluster Autoscaler Version: The example cluster_autoscaler_version in kube.tf.example has been updated from v1.30.3 to v1.33.3.
• Terraform Variable Default: The initial_k3s_channel variable in variables.tf now defaults to v1.33.

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[gemini-code-assist]

Code Review

This pull request updates the default k3s version to a supported one, v1.33. The changes are mostly in documentation examples and the default value for initial_k3s_channel. This is a good maintenance update. I've found one minor inconsistency regarding the cluster_autoscaler_version default value that should be addressed for completeness.