CODEOWNERS.md Fix

[Ranchhand87]

Please see the attached image. The @iohk handle needs to be updated. Please contact @Ranchhand87 if @paolino is a relevant maintainer and should be added to IntersectMBO team with Write access for this repository.

Please consider adapting CODEOWNERS.md format to match the boilerplate format found here: https://github.com/IntersectMBO/Open-Source-Office/blob/main/CODEOWNERS