gitlab upgrade - change in approval system

[Ryan Scott]

I would definitely appreciate changing Marge's behavior back to the old
one. As things stand currently, I am unable to approve anything that I'm
not explicitly listed as a reviewer for. See here [1] for an example of
where this has happened.

Ryan S.
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[1] https://gitlab.haskell.org/ghc/ghc/merge_requests/559#note_198714
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