Updating Code Owners

[schoork]

What github issue is this PR for, if any?

N/A

What changed, and why?

Who gets add as a reviewer

How is this tested? (please write tests!) 💖💪

Note: if you see a flake in your test build in github actions, please post in slack #casa "Flaky test: " :) 💪
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[schoork]

@elasticspoon Might be helpful to add the other RFG lead to the top line, too.