maintainers: add mazurel

maintainers/maintainer-list.nix

···
     githubId = 1191859;
     name = "Maxim Krivchikov";
   };
+  mazurel = {
+    email = "[e-mail]";
+    github = "Mazurel";
+    githubId = 22836301;
+    name = "Mateusz Mazur";
+  };
   mbakke = {
     email = "[e-mail]";
     github = "mbakke";