chore: Fix warnings for custom postgres_## cfg flags #1437

Job	Run time
Check	1m 29s
Integration Test (ubuntu-latest)	37s
Integration Test (macOS-13)	1m 45s
Integration Test (macOS-latest)	1m 13s
Functional Test (MySQL)	56s
Functional Test (PostgreSQL)	50s
Functional Test (SQLite)	39s
Build (windows-latest)	1m 57s
Build (ubuntu-latest)	56s
Build (macOS-latest)	46s
Build (macOS-13)	1m 27s
	12m 35s

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