tests

fix the CI: update bigdecimal and fix warnings #1970

Job	Run time
Build `sea-query`	46s
Clippy	2m 53s
Build `sea-query-binder` (async-std, rustls)	3m 19s
Build `sea-query-postgres`	1m 6s
Build `sea-query-rusqlite`	1m 9s
Rustfmt	25s
Unit Test	1m 42s
Derive Tests	40s
Any	58s
MariaDB (10.6, sqlx_mysql)	1m 54s
PostgreSQL (14.4, postgres)	1m 42s
MySQL (8, sqlx_mysql)	2m 38s
PostgreSQL (14.4, sqlx_postgres)	1m 56s
MySQL (5.7, sqlx_mysql)	1m 30s
PostgreSQL (13.7, postgres)	55s
SQLite (rusqlite)	32s
PostgreSQL (13.7, sqlx_postgres)	1m 15s
SQLite (sqlx_sqlite)	1m 36s
PostgreSQL (12.11, postgres)	47s
PostgreSQL (12.11, sqlx_postgres)	1m 16s
	28m 59s

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