chore: silence postgrex errors for database errors

[Ziinc]

15:20:28.535 [error] :gen_statem #PID<0.1682.0> terminating
** (RuntimeError) connect raised KeyError exception: key :database not found. The exception details are hidden, as they may contain sensitive data such as database credentials. You may set :show_sensitive_data_on_connection_error to true when starting your connection if you wish to see all of the details
    (elixir 1.17.3) lib/keyword.ex:602: Keyword.fetch!/2
    (postgrex 0.17.3) lib/postgrex/protocol.ex:163: Postgrex.Protocol.connect_endpoints/6
    (db_connection 2.6.0) lib/db_connection/connection.ex:92: DBConnection.Connection.handle_event/4
    (stdlib 6.1.2) gen_statem.erl:3737: :gen_statem.loop_state_callback/11
    (stdlib 6.1.2) proc_lib.erl:329: :proc_lib.init_p_do_apply/3
Queue: [internal: {:connect, :init}]
Postponed: []

This PR fixes this test error.