maintainers: update all-maintainers.nix

Automated update of the master maintainers list combining:
- Home Manager specific maintainers from modules/lib/maintainers.nix
- Nixpkgs maintainers referenced in Home Manager modules

**Added:** 1 maintainers
**Removed:** 0 maintainers
**Total:** 281 → 282 maintainers

**✅ Added:** magicquark

Generated by: lib/python/generate-all-maintainers.py

all-maintainers.nix

@@ -1538,6 +1538,12 @@
     name = "Lukas Nagel";
     source = "home-manager";
   };
+  magicquark = {
+    github = "magicquark";
+    githubId = 198001825;
+    name = "magicquark";
+    source = "nixpkgs";
+  };
   mainrs = {
     email = "5113257+mainrs@users.noreply.github.com";
     github = "mainrs";