Fix PgListener::try_recv #1572

Job	Run time
Integration Test (macOS-13)	55s
Integration Test (macOS-latest)	51s
Check	38s
Functional Test (MySQL)	46s
Build (ubuntu-latest)	53s
Integration Test (ubuntu-latest)	31s
Build (macOS-13)	1m 13s
Build (macOS-latest)	42s
Build (windows-latest)	2m 3s
Functional Test (SQLite)	34s
Functional Test (PostgreSQL)	44s
	9m 50s

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