Update k8s.io/utils digest to 28399d8

[ard-wg-k8s-gitbot]

This PR contains the following updates:

Package	Type	Update	Change
k8s.io/utils	require	digest	b8788ab → 28399d8

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[github-actions]

➡️ Go test coverage stayed the same at 79.1% compared to cd9740d (7 ignored files)

No change in coverage for any package.

View coverage for all packages

# Package Name                                                  | Coverage
+ code.cloudfoundry.org/k8s-garden-client/pkg/k8sgarden         |    79.8%
+ code.cloudfoundry.org/k8s-garden-client/pkg/k8sgarden/kubelet |    66.7%
+ code.cloudfoundry.org/k8s-garden-client/pkg/k8sgarden/log     |   100.0%
+ code.cloudfoundry.org/k8s-garden-client/pkg/k8sgarden/mocks   |   100.0%