Update dependency @kubernetes/client-node to ^0.21.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@kubernetes/client-node	^0.18.0 -> ^0.21.0

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Release Notes

kubernetes-client/javascript (@​kubernetes/client-node)

v0.21.0

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v0.20.0

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What's Changed

• Add node 20 to our test matrix, remove node 14, fix test for node 20. by @​brendandburns in https://github.com/kubernetes-client/javascript/pull/1269
• Automated Generate from openapi release-1.28 by @​github-actions in https://github.com/kubernetes-client/javascript/pull/1278
• Add an additional test for version synchronization by @​brendandburns in https://github.com/kubernetes-client/javascript/pull/1268
• Update to version 0.20.0 and k8s 1.28 support by @​brendandburns in https://github.com/kubernetes-client/javascript/pull/1281
• ci: pin node version to 20.7.0 to make unit tests pass by @​mstruebing in https://github.com/kubernetes-client/javascript/pull/1313
• chore: Some cleanup by @​Ananya2001-an in https://github.com/kubernetes-client/javascript/pull/1320
• Fix spelling in README.md by @​masonbrothers in https://github.com/kubernetes-client/javascript/pull/1345
• Fixed typo in topPods command by @​kamadek-sys in https://github.com/kubernetes-client/javascript/pull/1369
• feat(metrics): add single node metrics and query options by @​0fatal in https://github.com/kubernetes-client/javascript/pull/1368
• Update Kubernetes Version in README.md by @​masonbrothers in https://github.com/kubernetes-client/javascript/pull/1378
• A lot of dependency updates

New Contributors

• @​masonbrothers made their first contribution in https://github.com/kubernetes-client/javascript/pull/1345
• @​kamadek-sys made their first contribution in https://github.com/kubernetes-client/javascript/pull/1369
• @​0fatal made their first contribution in https://github.com/kubernetes-client/javascript/pull/1368

Full Changelog: https://github.com/kubernetes-client/javascript/compare/0.19.0...0.20.0

v0.19.0

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Release 0.19.0

• Support for Kubernetes 1.27 APIs
• Small bug fixes
• Many dependencies updated

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