Upgrade kubernetes dashboard to v2.1.0 for 1.20

[afbjorklund]

Now with support for Kubernetes version 1.20 too

https://github.com/kubernetes/dashboard/releases/tag/v2.1.0

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[afbjorklund]

This will probably affect the preload

[priyawadhwa]

LGTM, I think this will just require a bump in preload version so that the new image is included:

minikube/pkg/minikube/download/preload.go

Line 44 in c909561

PreloadVersion = "v7"

[afbjorklund]

And the bump is done just before generating the release preload, right ?

[priyawadhwa]

Yup, once the PR is merged then the release will kick off

[afbjorklund]

@priyawadhwa : my question was actually if it should be included in this commit

Or if there will be a separate preload version bump, later on ? (in the release process)

[priyawadhwa]

Ah, sorry! I think it's fine to include it in this PR.