updated the SDK to use latest LMI image for sdk v3.x #360

Job	Run time
collab-check	4s
wait-for-approval	5s
detect-changes	9s
unit-tests (sagemaker-train)	30m 9s
integ-tests (sagemaker-serve)	34m 1s
codestyle-doc-tests (sagemaker-serve)	6m 13s
unit-tests (sagemaker-core)	1h 8m 1s
codestyle-doc-tests (sagemaker-core)	29m 5s
codestyle-doc-tests (sagemaker-mlops)	6m 12s
integ-tests (sagemaker-mlops)	32m 39s
codestyle-doc-tests (sagemaker-train)	8m 45s
unit-tests (sagemaker-serve)	43m 55s
integ-tests (sagemaker-train)	1h 14m 15s
unit-tests (sagemaker-mlops)	32m 20s
integ-tests (sagemaker-core)	27m 2s
	6h 32m 55s

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