Dynamic CDK version testing

add workflow to test against multiple aws-cdk versions #45

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Run time

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Job	Run time
generate-cdk-version-matrix	4s
version-testing (1.95.1)	2m 21s
version-testing (1.150.0)	2m 15s
version-testing (2.30.0)	2m 20s
version-testing (2.50.0)	2m 19s
version-testing (2.75.0)	2m 21s
version-testing (2.120.0)	2m 24s
version-testing (2.166.0)	2m 24s
version-testing (2.167.0)	2m 20s
version-testing	2m 25s
	21m 13s