chore: Fix warnings for custom postgres_## cfg flags #1445

Job	Run time
Functional Test (PostgreSQL)	47s
Check	1m 27s
Integration Test (macOS-13)	2m 16s
Integration Test (ubuntu-latest)	41s
Integration Test (macOS-latest)	50s
Functional Test (MySQL)	50s
Functional Test (SQLite)	35s
Build (macOS-13)	1m 48s
Build (macOS-latest)	50s
Build (windows-latest)	1m 35s
Build (ubuntu-latest)	45s
	12m 24s

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