Fix issues with flaky logger handler tests (#901)

Author: solnic

test/sentry/client_test.exs

@@ -388,7 +388,7 @@ defmodule Sentry.ClientTest do
 
       event =
         fn ->
-          assert_receive {^ref, body}, 1000
+          assert_receive {^ref, body}, 5000
           assert [{%{"type" => "event"}, event}] = decode_envelope!(body)
           event
         end

test/sentry/logger_handler_test.exs

@@ -64,7 +64,7 @@ defmodule Sentry.LoggerHandlerTest do
 
     {:ok, _task_pid} = Task.start(fn -> raise "oops" end)
 
-    assert_receive {^ref, event}
+    assert_receive {^ref, event}, 5000
 
     assert event.user.user_id == 3
     assert event.extra.day_of_week == "Friday"