MAINTAINERS: Remove Samuel for now

Samuel hasn't had much time. So we remove him for now. I talked
to him and he is fine with it.

Author: dsp-ant

MAINTAINERS.md

@@ -58,7 +58,6 @@ This document lists current maintainers in the Model Context Protocol project.
 
 - [Inna Harper](https://github.com/ihrpr)
 - [Jerome Swannack](https://github.com/jerome3o)
-- [Samuel Colvin](https://github.com/samuelcolvin)
 - [Marcelo Trylesinski](https://github.com/Kludex)
 - [Max Isbey](https://github.com/maxisbey)