chore(deps): update github.com/kcp-dev/kubernetes/staging/src/k8s.io/apiserver digest to b63495f

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/kcp-dev/kubernetes/staging/src/k8s.io/apiserver	replace	digest	4b3495f → b63495f

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
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The artifact failure details are included below:

File name: go.sum

Command failed: go get -t ./...
go: module github.com/kcp-dev/kubernetes/staging/src/k8s.io/apiserver@v0.0.0-20260430062835-b63495f6b15b requires go >= 1.25.0; switching to go1.25.9
go: downloading github.com/kcp-dev/kubernetes/staging/src/k8s.io/apiserver v0.0.0-20260430062835-b63495f6b15b
go: github.com/platform-mesh/virtual-workspaces/cmd imports
	k8s.io/apiserver/pkg/server imports
	k8s.io/apiserver/pkg/endpoints/discovery/aggregated imports
	k8s.io/apimachinery/pkg/util/sort: cannot find module providing package k8s.io/apimachinery/pkg/util/sort
go: github.com/platform-mesh/virtual-workspaces/pkg/apidefinition imports
	github.com/kcp-dev/kcp/pkg/virtual/framework/dynamic/apiserver imports
	k8s.io/kubernetes/pkg/controlplane/apiserver/miniaggregator imports
	k8s.io/kubernetes/pkg/controlplane/apiserver imports
	k8s.io/apiserver/pkg/clientsethack imports
	k8s.io/client-go/kubernetes/typed/storagemigration/v1beta1: cannot find module providing package k8s.io/client-go/kubernetes/typed/storagemigration/v1beta1