pool-3.2.1

psycopg_pool 3.2.1 released

- Respect the `!timeout` parameter on `~ConnectionPool.connection()` when
  `!check` fails. Also avoid a busy-loop of checking; separate check attempts
  using an exponential backoff (:ticket:`#709`).
- Use `typing.Self` as a more correct return value annotation of context
  managers and other self-returning methods (see :ticket:`708`).
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