chore: bump `emqx_bridge_gcp_pubsub` version to 0.2.2

apps/emqx_bridge_gcp_pubsub/src/emqx_bridge_gcp_pubsub.app.src

@@ -1,6 +1,6 @@
 {application, emqx_bridge_gcp_pubsub, [
     {description, "EMQX Enterprise GCP Pub/Sub Bridge"},
-    {vsn, "0.2.1"},
+    {vsn, "0.2.2"},
     {registered, []},
     {applications, [
         kernel,