Update generated client to Kubernetes v1.37 (SDK 21.0)

[tg123]

Tracks the upstream v1.37 API surface and bumps the SDK accordingly.

• Generation inputs: csharp.settings now targets KUBERNETES_BRANCH=v1.37.0.
• Generated artifacts: swagger.json was regenerated with kubernetes-client/gen at d01fc8a15955e08c5102b7f9916a99b094ebd0e1.
• Versioning and docs: version.json is raised to 21.0, and the compatibility table includes Kubernetes 1.37.
• Compatibility: Kubernetes 1.37 makes ControllerRevision.revision optional, so rollout history preserves the API's zero-value behavior when the field is absent.

The generator issue documented in #1733 is fixed in the current gen revision: the injected API discovery models now include GroupVersionKind, and the C# source generator completes successfully.

Validation

• dotnet build kubernetes-client.proj --configuration Release --no-restore --nologo
• dotnet test tests\KubernetesClient.Tests\KubernetesClient.Tests.csproj --configuration Release --no-build --no-restore --nologo (627 passed)
• dotnet test tests\Kubectl.Tests\Kubectl.Tests.csproj --configuration Release --no-build --no-restore --nologo (102 Minikube tests skipped)

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tg123

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• OWNERS [tg123]

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: tg123 / name: Boshi LIAN (b67ce11)

[Copilot]

Pull request overview

Updates this repo’s generated Kubernetes client to align with the upstream Kubernetes v1.37 API surface and bumps the SDK versioning/docs to match.

Changes:

• Bump SDK version to 21.0 and update the README compatibility table for Kubernetes 1.37.
• Update generation inputs to target KUBERNETES_BRANCH=v1.37.0.
• Adjust rollout history handling to tolerate ControllerRevision.revision being absent by defaulting it to zero.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
version.json	Bumps SDK version to 21.0.
src/KubernetesClient.Kubectl/Beta/AsyncKubectl.Rollout.cs	Defaults nullable ControllerRevision.Revision to zero for rollout history.
README.md	Adds the 21.0 / 1.37 compatibility row.
csharp.settings	Updates generator branch target to v1.37.0.

Suppressed comments (1)

src/KubernetesClient.Kubectl/Beta/AsyncKubectl.Rollout.cs:458

• RolloutHistoryEntry.Revision is a long, but the null-coalescing fallback uses an int literal (0). Consider using 0L for consistency and to avoid implicit numeric conversion.

                return new RolloutHistoryEntry
                {
                    Revision = cr.Revision ?? 0,
                    ChangeCause = changeCause,
                };

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 5 changed files in this pull request and generated no new comments.