gardener-controlplane-1.76.4

[gardener/gardener]

🐛 Bug Fixes

• [OPERATOR] Update Kubernetes dependencies (especially k8s.io/client-go) from v0.26.3 to v0.26.4 to resolve panic on working with special shoots. by @gardener-ci-robot [#8425]
• [OPERATOR] An issue has been fixed which was causing a broken ControlPlaneHealthy condition report for Shoots when the MachineControllerManagerDeployment feature gate gets enabled until their next reconciliation. by @gardener-ci-robot [#8409]