chore(appup): add appup for plugin libs

apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src

@@ -1,6 +1,6 @@
 {application, emqx_plugin_libs,
  [{description, "EMQ X Plugin utility libs"},
-  {vsn, "4.3.0"},
+  {vsn, "4.3.1"},
   {modules, []},
   {applications, [kernel,stdlib]},
   {env, []}

apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src

@@ -0,0 +1,13 @@
+%% -*- mode: erlang -*-
+{VSN,
+ [ {"4.3.0",
+    [ {add_module, emqx_plugin_libs_pool}
+    ]},
+   {<<".*">>, []}
+ ],
+ [ {"4.3.0",
+    [ {delete_module, emqx_plugin_libs_pool}
+    ]},
+   {<<".*">>, []}
+ ]
+}.