ci: remove runtime version override #1224

Job	Run time
setup	16s
validate-example (actor)	2m 14s
validate-example (configuration)	1m 29s
validate-example (crypto)	1m 23s
validate-example (dist-scheduler)	1m 2s
validate-example (grpc-service)	2m 7s
validate-example (hello-world)	54s
validate-example (pubsub)	1m 53s
validate-example (streamsub)	59s
validate-example (service)	2m 2s
validate-example (socket)	51s
validate-example (workflow)	1m 33s
validate-example (workflow-parallel)	1m 4s
	17m 47s

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