v2.139.0

This release includes several stability improvements, following initial
feedback from the stable-2.10.0 release:

* The control plane proxies no longer emit warnings about the resolution
  stream ending. This error was innocuous.
* The proxy's logging infrastructure has been updated to avoid including
  client addresses in cached logging spans. Now, client addresses are
  preserved to be included in warning logs. This should reduce memory
  pressure in high-connection environments.
* The proxy could infinitely retry failed requests to the destination
  controller when it returned a FailedPrecondition, indicating an
  unexpected cluster state. These errors are now handled gracefully.