Bump k8s.io/uitls to 8e7ff06

The reason for the bump is the new functionality of the
k8s.io/utils/exec package which allows
- to get a hold of the process' std{out,err} as `io.Reader`s
- to `Start` a process and `Wait` for it

This should help on addressing #70890 by allowing to wrap std{out,err}
of the process to be wrapped with a `io.limitedReader`.

It also updates
- k8s.io/kubernetes/pkg/probe/exec.FakeCmd
- k8s.io/kubernetes/pkg/kubelet/prober.execInContainer
- k8s.io/kubernetes/cmd/kubeadm/app/phases/kubelet.fakeCmd
to implement the changed interface.

The dependency on 'k8s.io/utils/pointer' to the new version has also
been bumped in some staging repos:
- apiserver
- kube-controller-manager
- kube-scheduler

vendor/k8s.io/utils/pointer/pointer.go

@@ -74,3 +74,13 @@ func BoolPtr(b bool) *bool {
 func StringPtr(s string) *string {
 	return &s
 }
+
+// Float32Ptr returns a pointer to the passed float32.
+func Float32Ptr(i float32) *float32 {
+	return &i
+}
+
+// Float64Ptr returns a pointer to the passed float64.
+func Float64Ptr(i float64) *float64 {
+	return &i
+}