maintainers: add jfvillablanca

maintainers/maintainer-list.nix

···
       fingerprint = "7EB1 C02A B62B B464 6D7C  E4AE D1D0 9DE1 69EA 19A0";
     }];
   };
+  jfvillablanca = {
+    email = "[e-mail]";
+    matrix = "@jfvillablanca:matrix.org";
+    github = "jfvillablanca";
+    githubId = 31008330;
+    name = "Jann Marc Villablanca";
+  };
   jgart = {
     email = "[e-mail]";
     github = "jgarte";