test(emqx_bridge_pgsql_SUITE): call test janitor

apps/emqx_bridge_pgsql/test/emqx_bridge_pgsql_SUITE.erl

@@ -135,6 +135,7 @@ end_per_testcase(_Testcase, Config) ->
     connect_and_clear_table(Config),
     ok = snabbkaffe:stop(),
     delete_bridge(Config),
+    emqx_common_test_helpers:call_janitor(),
     ok.
 
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