add workflow to test against multiple aws-cdk versions #61

Job	Run time
integration-python (python, 18.x, 3.9, us-east-1)	1m 46s
integration-python (python, 20.x, 3.10, us-east-1)	1m 41s
integration-python (python, 21.x, 3.11, us-east-1)	1m 44s
integration-python (python, 22.x, 3.12, us-east-1)	1m 51s
	7m 2s

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