add thefenriswolf as maintainer

maintainers/maintainer-list.nix

@@ -6720,6 +6720,12 @@
     githubId = 42933;
     name = "Andrew Childs";
   };
+  thefenriswolf = {
+    email = "stefan.rohrbacher97@gmail.com";
+    github = "thefenriswolf";
+    githubId = "8547242";
+    name = "Stefan Rohrbacher";
+  };
   thesola10 = {
     email = "thesola10@bobile.fr";
     github = "thesola10";