chore: update test postgres configuration

Author: btkostner

config/test.exs

@@ -3,9 +3,11 @@ import Config
 config :ex_machina, preserve_dates: true
 
 config :ex_machina, ExMachina.TestRepo,
-  hostname: "localhost",
-  database: "ex_machina_test",
   pool: Ecto.Adapters.SQL.Sandbox,
-  username: "postgres"
+  hostname: "localhost",
+  port: "5432"
+  username: "postgres",
+  password: "postgres",
+  database: "ex_machina_test"
 
 config :logger, level: :warning