[release-4.6] install-approvers: add staebler

[openshift-cherrypick-robot]

This is an automated cherry-pick of #4297

/assign sdodson

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sdodson]

/cherrypick release-4.5

[openshift-cherrypick-robot]

@sdodson: new pull request created: #4299

In response to this:

/cherrypick release-4.5

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