[wip] Add nikhita, drop grodrigues3 from github admin team

[spiffxp]

/hold
awaiting steering committee approval, ref: kubernetes/community#3148

Also using [wip] because I'm extra paranoid

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[k8s-ci-robot]

@spiffxp: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-org-test-all	56230b8	link	/test pull-org-test-all

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[cblecker]

/close
in favour of #414

[k8s-ci-robot]

@cblecker: Closed this PR.

In response to this:

/close
in favour of #414

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