Bump SQLx to 0.8 #2157

Job	Run time
Build `sea-query-postgres`	37s
Build `sea-query-binder` (async-std, rustls)	1m 54s
Build `sea-query`	48s
Clippy	50s
Build `sea-query-rusqlite`	35s
Rustfmt	18s
Derive Tests	35s
Unit Test	1m 44s
SQLite (rusqlite)	20s
SQLite (sqlx_sqlite)	53s
Any	1m 5s
MariaDB (10.6, sqlx_mysql)	1m 15s
MySQL (8, sqlx_mysql)	1m 20s
MySQL (5.7, sqlx_mysql)	1m 34s
PostgreSQL (14.4, postgres)	54s
PostgreSQL (14.4, sqlx_postgres)	2m 1s
PostgreSQL (13.7, postgres)	57s
PostgreSQL (13.7, sqlx_postgres)	1m 29s
PostgreSQL (12.11, postgres)	50s
PostgreSQL (12.11, sqlx_postgres)	1m 31s
	21m 30s

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