Use correct format placeholder for pids

Peter Eisentraut <peter@eisentraut.org>

Commit: 640b91c3ed24002b34c7226fb51ef9176fb72713
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-04-19T08:43:18Z
Releases: 14.0
Use correct format placeholder for pids

Should be signed, not unsigned.

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