chore(deps): update dependency mysql2 to v3.7.1 #957

Job	Run time
SQLite (Node 10, Sequelize 5)	5m 22s
SQLite (Node 10, Sequelize latest)	5m 33s
MySQL (Node 10, Sequelize 5)	50s
Postgres (Node 10, Sequelize 5)	6m 18s
SQLite (Node 16, Sequelize 5)	5m 13s
MySQL (Node 10, Sequelize latest)	49s
Postgres (Node 10, Sequelize latest)	6m 25s
SQLite (Node 16, Sequelize latest)	5m 15s
MySQL (Node 16, Sequelize 5)	6m 13s
Postgres (Node 16, Sequelize 5)	6m 3s
MySQL (Node 16, Sequelize latest)	6m 23s
Postgres (Node 16, Sequelize latest)	6m 4s
Release	0s
	1h 0m 28s

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