Add Dependabot config #14

Job	Run time
bun-mysql (examples/bun-mysql2, mysql)	28s
bun-postgresql (examples/bun-pg, postgresql)	26s
node-mysql (examples/node-mysql2, mysql)	29s
node-postgresql (examples/node-pg, postgresql)	39s
bun-postgresql (examples/bun-postgres, postgresql)	34s
node-postgresql (examples/node-postgres, postgresql)	33s
	3m 9s

Provide feedback