[FAP-26] Add Heitor's SSH key

Problem: For FAP-26, I need to SSH into a server, but I need permission first.

Solution: Add my key to ssh-keys.nix.

modules/ssh-keys.nix

@@ -84,4 +84,8 @@
   ruben = [
     "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDeEgqGkRli0z6ccp9ucndAroo3yShAmU2wAFws+5iGw slack@eureka"
   ];
+  # Heitor Toledo Lassarote de Paula
+  heitor = [
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIH8OXnif02/DPrl9ZjOTC0V+u2nPVoYuO5ZV1ryPUZhg [email protected]"
+  ];
 }