treewide: remove ma27 from the maintainer-list of a few packages

These are all packages that I stopped using and hence just create noise
in my inbox for each change affecting them and let's face it, while I
still enjoy contributing to nixpkgs, it doesn't really make sense to be
listed there if I can't do much anyways.

Each of these packages can be taken over by someone or removed if
people think that's reasonable.

Of course, if other maintainers face issues, I can answer some questions
if needed & possible.

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