Remove unnecessary boxfutures #1290

Job	Run time
Functional Test (PostgreSQL)	48s
Build (ubuntu-latest)	50s
Check	54s
Build (windows-latest)	2m 4s
Build (macOS-13)	1m 20s
Build (macOS-latest)	46s
Functional Test (SQLite)	39s
Integration Test (ubuntu-latest)	38s
Functional Test (MySQL)	49s
Integration Test (macOS-latest)	51s
Integration Test (macOS-13)	59s
	10m 38s

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