Update k8s-openapi requirement from 0.20 to 0.21

[dependabot[bot]]

Updates the requirements on k8s-openapi to permit the latest version.

Release notes

Sourced from k8s-openapi's releases.

v0.21.0

k8s-openapi

• BREAKING CHANGE: Added support for Kubernetes 1.29 under the v1_29 feature.

• BREAKING CHANGE: Dropped support for Kubernetes 1.22 and 1.23.

Corresponding Kubernetes API server versions:

• v1.24.17
• v1.25.16
• v1.26.13
• v1.27.10
• v1.28.6
• v1.29.1

k8s-openapi-codegen-common

• No changes.

k8s-openapi-derive

• No changes.

Changelog

Sourced from k8s-openapi's changelog.

v0.21.0 (2024-01-19)

k8s-openapi

• BREAKING CHANGE: Added support for Kubernetes 1.29 under the v1_29 feature.

• BREAKING CHANGE: Dropped support for Kubernetes 1.22 and 1.23.

Corresponding Kubernetes API server versions:

• v1.24.17
• v1.25.16
• v1.26.13
• v1.27.10
• v1.28.6
• v1.29.1

k8s-openapi-codegen-common

• No changes.

k8s-openapi-derive

• No changes.

---

v0.20.0 (2023-09-07)

k8s-openapi

• BREAKING CHANGE: This release removes all associated methods of resource types that mapped API operations. For example, there is no more fn api::core::v1::Pod::list(), and all types related to API operations like ListOptional and ResponseBody have also been removed. See Arnavion/k8s-openapi#149 for more details.

• BREAKING CHANGE: Added support for Kubernetes 1.28 under the v1_28 feature.

• BREAKING CHANGE: Dropped support for Kubernetes 1.20 and 1.21.

Corresponding Kubernetes API server versions:

• v1.22.17
• v1.23.17
• v1.24.17
• v1.25.13
• v1.26.8
• v1.27.5
• v1.28.1

k8s-openapi-codegen-common

• BREAKING CHANGE: write_operation and other things related to emitting API operations have been removed.

... (truncated)

Commits

• 5337d70 v0.21.0
• 7103d72 Suppress dead code warnings reported by nightly rustc in clientset response e...
• 5edc0ee Fix nightly clippy lints.
• 00a7829 Update to v1.26.13, v1.27.10, v1.28.6, v1.29.1
• c1fc48c Update to v1.26.12, v1.27.9, v1.28.5
• 5670a50 Backport v1.29 changes to merge strategy of `PodSchedulingContextSpec::potent...
• 00671dd Add v1.29.0
• 347c59a Update http to v1
• e1445f6 Remove unused deps.
• 9a8d679 Update to v1.25.16
• Additional commits viewable in compare view

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