Add sohankunkerkar to `sig-node-cri-o-test-maintainers`

[saschagrunert]

cc @sohankunkerkar @kubernetes/sig-node-cri-o-test-maintainers

[harche]

/lgtm

[saschagrunert]

/assign @mrunalp

[saschagrunert]

cc @kubernetes/sig-node-leads

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mrunalp, saschagrunert

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