Fix postgres-vector test cases (#812) #2188

Job	Run time
Build `sea-query-postgres`	45s
Build `sea-query-binder` (async-std, rustls)	2m 7s
Clippy	1m 2s
Build `sea-query`	48s
Rustfmt	17s
Build `sea-query-rusqlite`	35s
Derive Tests	40s
Unit Test	2m 13s
SQLite (rusqlite)	21s
PostgreSQL (14.4, postgres)	55s
SQLite (sqlx_sqlite)	52s
PostgreSQL (14.4, sqlx_postgres)	1m 19s
MariaDB (10.6, sqlx_mysql)	1m 15s
Any	1m 5s
PostgreSQL (13.7, postgres)	51s
PostgreSQL (13.7, sqlx_postgres)	1m 20s
MySQL (8, sqlx_mysql)	1m 17s
PostgreSQL (12.11, postgres)	50s
MySQL (5.7, sqlx_mysql)	1m 16s
PostgreSQL (12.11, sqlx_postgres)	1m 20s
	21m 8s

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