maintainers: update leixb (#446627)

maintainers/maintainer-list.nix

···
     name = "Leiser Fernández Gallo";
   };
   leixb = {
-    email = "[e-mail]";
+    email = "[e-mail]";
     matrix = "@leix_b:matrix.org";
     github = "Leixb";
     githubId = 17183803;
     name = "Aleix Boné";
-    keys = [ { fingerprint = "63D3 F436 EDE8 7E1F 1292  24AF FC03 5BB2 BB28 E15D"; } ];
   };
   lejonet = {
     email = "[e-mail]";