fix(deps): update rust crate k8s-openapi to 0.21.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
k8s-openapi	dependencies	patch	0.21.0 -> 0.21.1

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Release Notes

Arnavion/k8s-openapi (k8s-openapi)

v0.21.1

Compare Source

k8s-openapi

• BUGFIX: Fix schemars::JsonSchema impl of k8s_openapi::apimachinery::pkg::util::intstr::IntOrString to be in line with what Kubernetes expects of int-or-string fields in CRDs.

Corresponding Kubernetes API server versions:

• v1.24.17
• v1.25.16
• v1.26.14
• v1.27.11
• v1.28.7
• v1.29.2

k8s-openapi-codegen-common

• BUGFIX: See the bugfix mentioned above.

k8s-openapi-derive

• No changes except to bump the k8s-openapi-codegen-common dependency to the new version.

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