Hi all, When attempting to upgrade a running Dataflow pipeline from SDK 2.51.0 to 2.52.0, an incompatibility warning is surfaced that prevents pipeline upgrade:
> The Coder or type for step .../PubsubUnboundedSource has changed Was there an intentional coder change introduced for PubsubMessage in 2.52.0? I didn't note anything in the release notes https://beam.apache.org/blog/beam-2.52.0/ nor recent changes in PubsubMessageWithAttributesCoder[1]. Specifically the step uses `PubsubMessageWithAttributesCoder` via `PubsubIO.readMessagesWithAttributes()` Thanks! [1] https://github.com/apache/beam/blob/90e79ae373ab38cf4e48e9854c28aaffb0938458/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubMessageWithAttributesCoder.java#L36
