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:** 297 → 298 maintainers

**✅ Added:** marijanp

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

all-maintainers.nix

@@ -1618,6 +1618,13 @@
     name = "Manaiki Laut";
     source = "nixpkgs";
   };
+  marijanp = {
+    email = "marijan.petricevic94@gmail.com";
+    github = "marijanp";
+    githubId = 13599169;
+    name = "Marijan Petričević";
+    source = "nixpkgs";
+  };
   mateusauler = {
     email = "mateus@auler.dev";
     github = "mateusauler";