[#6509] Add dependabot configuration #8646

Job	Run time
changes	8s
SparkIT-on-push	0s
SparkIT-on-pr (linux/amd64, 17, 2.12, deploy) / JDK17-deploy-Scala2.12	46m 28s
SparkIT-on-pr (linux/amd64, 17, 2.12, embedded) / JDK17-embedded-Scala2.12	47m 22s
	1h 33m 58s

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