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:** 285 → 286 maintainers

**✅ Added:** oneorseveralcats

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

all-maintainers.nix

@@ -1854,6 +1854,12 @@
     name = "Olmo Kramer";
     source = "home-manager";
   };
+  oneorseveralcats = {
+    github = "oneorseveralcats";
+    githubId = 170012754;
+    name = "oneorseveralcats";
+    source = "home-manager";
+  };
   onny = {
     email = "onny@project-insanity.org";
     github = "onny";