style: fix type problem found by dialyzer

apps/emqx_bridge/src/emqx_bridge_v2.erl

@@ -164,7 +164,7 @@
 
 -type root_cfg_key() :: ?ROOT_KEY_ACTIONS | ?ROOT_KEY_SOURCES.
 
--export_type([root_cfg_key/0]).
+-export_type([root_cfg_key/0, bridge_v2_type/0, bridge_v2_name/0]).
 
 %%====================================================================
 

apps/emqx_rule_engine/include/rule_engine.hrl

@@ -42,7 +42,8 @@
         func := builtin_action_func() | atom(),
         args => action_fun_args()
     }
-    | bridge_channel_id().
+    | bridge_channel_id()
+    | {bridge_v2, emqx_bridge_v2:bridge_v2_type(), emqx_bridge_v2:bridge_v2_name()}.
 
 -type rule() ::
     #{