Upgrade kubernetes dashboard from v2.6.0 to v2.7.0

[ziyi-xie]

Kubernetes dashboard has been upgraded to v2.7.0 now, and this PR fixed the version of dashboard to v2.7.0 in minikube.
https://github.com/kubernetes/dashboard/releases

[minikube-bot]

Can one of the admins verify this patch?

[spowelljr]

/ok-to-test

[minikube-pr-bot]

kvm2 driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 15000) |
+----------------+----------+---------------------+
| minikube start | 56.8s    | 56.8s               |
| enable ingress | 29.1s    | 27.4s               |
+----------------+----------+---------------------+

Times for minikube (PR 15000) start: 56.2s 58.3s 56.6s 58.1s 55.1s
Times for minikube start: 59.9s 57.8s 54.3s 55.2s 56.6s

Times for minikube (PR 15000) ingress: 24.6s 29.2s 28.7s 25.2s 29.1s
Times for minikube ingress: 30.7s 28.2s 28.2s 28.6s 29.7s

docker driver with docker runtime
error collecting results for docker driver: timing run 0 with minikube: timing cmd: [out/minikube addons enable ingress]: waiting for minikube: exit status 10
docker driver with containerd runtime
error downloading artifacts: artifact download start: exit status 90

[minikube-pr-bot]

These are the flake rates of all failed tests.

Environment	Failed Tests	Flake Rate (%)
KVM_Linux	TestCertExpiration (gopogh)	0.00 (chart)
Hyper-V_Windows	TestNetworkPlugins/group/flannel/NetCatPod (gopogh)	3.23 (chart)
Docker_Linux_containerd	TestNetworkPlugins/group/auto/DNS (gopogh)	4.24 (chart)
none_Linux	TestAddons/parallel/MetricsServer (gopogh)	12.50 (chart)
Docker_macOS	TestFunctional/parallel/DashboardCmd (gopogh)	12.75 (chart)
Hyper-V_Windows	TestNetworkPlugins/group/bridge/Start (gopogh)	13.97 (chart)
Hyper-V_Windows	TestNetworkPlugins/group/kubenet/Start (gopogh)	20.59 (chart)
Docker_Linux_containerd	TestOffline (gopogh)	26.11 (chart)
Docker_Linux_containerd	TestAddons/Setup (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/DashboardCmd (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/MountCmd/any-port (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/MySQL (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/PersistentVolumeClaim (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/ServiceCmd (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/ServiceCmdConnect (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/TunnelCmd/serial/AccessDirect (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/parallel/TunnelCmd/serial/WaitService/Setup (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/serial/ExtraConfig (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/serial/SoftStart (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestFunctional/serial/StartWithProxy (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestIngressAddonLegacy/serial/ValidateIngressAddonActivation (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestIngressAddonLegacy/StartLegacyK8sCluster (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestJSONOutput/start/Command (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestMultiNode/serial/AddNode (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestMultiNode/serial/DeployApp2Nodes (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestMultiNode/serial/FreshStart2Nodes (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestMultiNode/serial/PingHostFrom2Pods (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestMultiNode/serial/ProfileList (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestMultiNode/serial/StartAfterStop (gopogh)	28.03 (chart)
Docker_Linux_containerd	TestMultiNode/serial/StopNode (gopogh)	28.03 (chart)
More tests...	Continued...

Too many tests failed - See test logs for more details.

To see the flake rates of all tests by environment, click here.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: spowelljr, ziyi-xie

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