CNF-13593: Update OWNERS to add midstream reviewers for Dockerfile and CSV changes

[leo8a]

/cc @rauhersu @fontivan @donpenney

[openshift-ci-robot]

@leo8a: This pull request references CNF-13593 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.18.0" version, but no target version was set.

In response to this:

/cc @rauhersu @fontivan @donpenney

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[leo8a]

updated only for ^Dockerfiles given that we plan to drop ^Containerfiles soon

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: donpenney, rauhersu

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