Fix PgListener::try_recv #1570

Job	Run time
Functional Test (PostgreSQL)	40s
Functional Test (SQLite)	31s
Integration Test (macOS-13)	53s
Integration Test (macOS-latest)	28s
Build (ubuntu-latest)	45s
Build (windows-latest)	2m 13s
Check	1m 34s
Build (macOS-latest)	45s
Build (macOS-13)	1m 1s
Integration Test (ubuntu-latest)	29s
Functional Test (MySQL)	56s
	10m 15s

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