- update to 3.17.6:
  * Fix bug in recursive `model.delete_instance()` when a table
    contains foreign-keys at multiple depths of the graph
  * Fix regression in pool behavior on systems where
    `time.time()` returns identical values for two connections.
    This adds a no-op comparable sentinel to the heap to prevent
    any recurrence of this problem.
  * Ensure that subqueries inside `CASE` statements generate
    correct SQL.
  * Fix regression that broke server-side cursors with Postgres
  * Fix to ensure compatibility with psycopg3 - the libpq
    TransactionStatus constants are no longer available on the
    `Connection` instance.
  * Fix quoting issue in pwiz that could generate invalid python
    code for double-quoted string literals used as column defaults.

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