fix: gateway app must depends on all auth apps

apps/emqx_gateway/src/emqx_gateway.app.src

@@ -4,7 +4,9 @@
     {vsn, "0.1.33"},
     {registered, []},
     {mod, {emqx_gateway_app, []}},
-    {applications, [kernel, stdlib, emqx, emqx_auth, emqx_ctl]},
+    {applications, [kernel, stdlib, emqx, emqx_auth, emqx_ctl, emqx_auth_http,
+                    emqx_auth_mnesia, emqx_auth_jwt, emqx_auth_mysql, emqx_auth_postgresql,
+                    emqx_auth_mongodb, emqx_auth_redis, emqx_auth_ldap]},
     {env, []},
     {modules, []},
     {licenses, ["Apache 2.0"]},