add workflow to test against multiple aws-cdk versions #95

Job	Run time
integration-nodejs (javascript, 18.x, us-east-1)	1m 42s
integration-nodejs (typescript, 20.x, eu-west-2)	1m 43s
integration-nodejs (typescript, 21.x, us-east-1)	1m 41s
integration-nodejs (typescript, 22.x, us-east-1)	1m 43s
	6m 49s

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