update OWNERS: rm danil-grigorev

[mtulio]

Remove user that left Red Hat, follow up https://github.com/openshift/release/pull/69181/files#r2371391246

[mtulio]

/assign vrutkovs

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@mtulio: no rehearsable tests are affected by this change

[vrutkovs]

/approve
/lgtm

[elmiko]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elmiko, mtulio, vrutkovs

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Needs approval from an approver in each of these files:

• ci-operator/step-registry/ccm/OWNERS [elmiko]
• ci-operator/step-registry/openshift/e2e/aws/ccm/OWNERS [elmiko,vrutkovs]
• ci-operator/step-registry/openshift/e2e/azure/ccm/OWNERS [elmiko,vrutkovs]
• ci-operator/step-registry/openshift/e2e/openstack/ccm/OWNERS [elmiko,vrutkovs]

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[openshift-ci]

@mtulio: all tests passed!

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