spotVM for GKE Node Pools is out of beta

[modular-magician]

Hi,
following this PR: GoogleCloudPlatform/magic-modules#5443

Spot VM for GKE is out of beta: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/NodeConfig

Thanks

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes). --> I guess it's a small change
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests. --> Link doesn't work
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests). --> Links don't work
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

container: added `spot` field to `node_config` sub-resource

Derived from GoogleCloudPlatform/magic-modules#6086

[github-actions]

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