fixed on conflict do nothing for MySQL #1885

Job	Run time
Build `sea-query`	1m 15s
Build `sea-query-binder` (async-std, rustls)	4m 12s
Clippy	2m 48s
Build `sea-query-rusqlite`	49s
Build `sea-query-postgres`	1m 35s
Rustfmt	25s
Derive Tests	1m 22s
Unit Test	3m 52s
MariaDB (10.6, sqlx_mysql)	2m 25s
SQLite (rusqlite)	1m 11s
SQLite (sqlx_sqlite)	1m 59s
Any	1m 52s
MySQL (8, sqlx_mysql)	2m 4s
MySQL (5.7, sqlx_mysql)	2m 19s
PostgreSQL (14.4, postgres)	1m 15s
PostgreSQL (14.4, sqlx_postgres)	3m 0s
PostgreSQL (13.7, postgres)	1m 53s
PostgreSQL (13.7, sqlx_postgres)	2m 12s
PostgreSQL (12.11, postgres)	1m 19s
PostgreSQL (12.11, sqlx_postgres)	2m 12s
	39m 59s

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