add toastal to maintainers

maintainers/maintainer-list.nix

@@ -10678,6 +10678,16 @@
     githubId = 9853194;
     name = "Philipp Bartsch";
   };
+  toastal = {
+    email = "toastal+nix@posteo.net";
+    github = "toastal";
+    githubId = 561087;
+    name = "toastal";
+    keys = [{
+      longkeyid = "ed25519/5CCE6F1466D47C9E";
+      fingerprint = "7944 74B7 D236 DAB9 C9EF  E7F9 5CCE 6F14 66D4 7C9E";
+    }];
+  };
   tobim = {
     email = "nix@tobim.fastmail.fm";
     github = "tobim";