meta: move stefanmb to Collaborator Emeriti list
I asked Stefan if they would mind being moved to Collaborator Emeritus. They responded that they were not active in Node.js right now and that moving them was fine.
R=@stefanmb
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines