Add Dependabot config #13

Job	Run time
bun-postgresql (examples/bun-postgres, postgresql)	33s
bun-postgresql (examples/bun-pg, postgresql)	30s
node-postgresql (examples/node-pg, postgresql)	33s
node-postgresql (examples/node-postgres, postgresql)	32s
bun-mysql (examples/bun-mysql2, mysql)	26s
node-mysql (examples/node-mysql2, mysql)	29s
	3m 3s

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