chore: Fix warnings for custom postgres_## cfg flags #1414

Job	Run time
Functional Test (PostgreSQL)	51s
Integration Test (macOS-13)	1m 1s
Integration Test (macOS-latest)	44s
Check	1m 20s
Integration Test (ubuntu-latest)	35s
Build (macOS-latest)	43s
Functional Test (SQLite)	42s
Build (ubuntu-latest)	1m 3s
Build (windows-latest)	1m 41s
Functional Test (MySQL)	54s
Build (macOS-13)	1m 10s
	10m 44s

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