chore: bump validation dapr runtime to 1.15.0-rc.2 (#667) #1322

Job	Run time
setup	13s
validate-example (actor)	2m 11s
validate-example (configuration)	1m 25s
validate-example (conversation)	1m 31s
validate-example (crypto)	1m 13s
validate-example (dist-scheduler)	1m 6s
validate-example (grpc-service)	2m 8s
validate-example (hello-world)	47s
validate-example (pubsub)	2m 2s
validate-example (streamsub)	1m 1s
validate-example (service)	1m 56s
validate-example (socket)	48s
validate-example (workflow)	1m 30s
validate-example (workflow-parallel)	1m 3s
	18m 54s

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