chore: bump validation dapr runtime to 1.15.0-rc.2 #1317

Job	Run time
setup	12s
validate-example (actor)	2m 14s
validate-example (configuration)	1m 20s
validate-example (conversation)	1m 36s
validate-example (crypto)	1m 6s
validate-example (dist-scheduler)	1m 1s
validate-example (grpc-service)	2m 12s
validate-example (hello-world)	46s
validate-example (pubsub)	1m 55s
validate-example (streamsub)	1m 0s
validate-example (service)	1m 53s
validate-example (socket)	45s
validate-example (workflow)	1m 28s
validate-example (workflow-parallel)	57s
	18m 25s

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