Revert "maintainer-list: drop gm6k"

[zeuner]

Description of changes

#275328 by @Mic92 violated community guidelines (https://github.com/NixOS/nixpkgs/blob/master/maintainers/README.md?plain=1#L45 ff.) and should be reverted ASAP to prevent further damage. Supersedes #275396.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[rhendric]

Leaving aside the needlessly confrontational language¹ in the PR description, as I argued in
#275396 (comment), I think this PR should be merged while any proposed changes to whether GitHub accounts are required in maintainer-list.nix are debated, because we all know that debate could take months if not years.

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¹ Seriously @zeuner, you're not doing yourself any favors by repeatedly calling out a trusted member of the community as ‘violat[ing] community guidelines’ when there are other, more generous interpretations at hand—can't you see how you're making this worse for yourself? Your feelings about how all this has gone down are understandably negative but exaggerating the actions others have taken that you don't like is not going to lead to reconciliation. If you have to blow off some steam, I strongly recommend doing it somewhere else.

[Janik-Haag]

I'm gonna merge this for the reasons @rhendric pointed out. But please stop writing hostile messages, it isn't just attacking the people you mention but also makes it very unpleasant to interact with you and leads to unneeded heated discussions that just wast the time of everyone involved.