Bump SQLx to 0.8 #2158

Job	Run time
Build `sea-query-postgres`	40s
Clippy	52s
Build `sea-query`	47s
Build `sea-query-binder` (async-std, rustls)	1m 59s
Build `sea-query-rusqlite`	36s
Rustfmt	15s
Unit Test	1m 41s
Derive Tests	43s
MariaDB (10.6, sqlx_mysql)	1m 14s
MySQL (8, sqlx_mysql)	1m 18s
PostgreSQL (14.4, postgres)	53s
MySQL (5.7, sqlx_mysql)	1m 24s
SQLite (rusqlite)	22s
PostgreSQL (14.4, sqlx_postgres)	1m 17s
Any	1m 5s
SQLite (sqlx_sqlite)	51s
PostgreSQL (13.7, postgres)	52s
PostgreSQL (13.7, sqlx_postgres)	1m 15s
PostgreSQL (12.11, postgres)	54s
PostgreSQL (12.11, sqlx_postgres)	1m 15s
	20m 13s

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