migrate broken link from k8s-testgrid.appspot.com to testgrid.k8s.io …

[anshikavashistha]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Fixes a broken link to testgrid dashboard in docs/maintainers/MAINTAINERS.md

Which issue(s) this PR fixes:
This is related to an umbrella issue and fixes a task of the same:
kubernetes/test-infra#30370

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: anshikavashistha

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[ardaguclu]

Thanks for opening this PR. But this repo does not take any direct pull requests. Instead you can open a PR in Kubernetes and if it is merged, it will be mirrored to this repo automatically.

/close

[k8s-ci-robot]

@ardaguclu: Closed this PR.

In response to this:

Thanks for opening this PR. But this repo does not take any direct pull requests. Instead you can open a PR in Kubernetes and if it is merged, it will be mirrored to this repo automatically.

/close

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