3.0.6

Psycopg 3.0.6 released

- Allow to use `Cursor.description` if the connection is closed
  (:ticket:`#172`).
- Don't raise exceptions on `ServerCursor.close()` if the connection is closed
  (:ticket:`#173`).
- Fail on `Connection.cursor()` if the connection is closed (:ticket:`#174`).
- Raise `ProgrammingError` if out-of-order exit from transaction contexts is
  detected (:tickets:`#176, #177`).
- Add `!CHECK_STANDBY` value to `~pq.ConnStatus` enum.
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