Prevent stuck cancel requests from blocking close - #1349
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Summary
Prevent an in-flight PostgreSQL CancelRequest task from keeping Connection.close(timeout=...) alive beyond the requested graceful-close timeout.
Changes
Test plan
Use the self-contained fake-server reproducer from #1326: after a command timeout creates a held-open cancel connection, conn.close(timeout=2) should no longer wait indefinitely.
Fixes #1326