Fix(lambda_update): ignore image_uri based on a var #846

Job	Run time
Collect workflow inputs	6s
Max TF pre-commit	1m 52s
Min TF pre-commit (./modules/deploy)	23s
Min TF pre-commit (./modules/docker-build)	31s
Min TF pre-commit (.)	26s
Min TF pre-commit (./examples/alias)	25s
Min TF pre-commit (./modules/alias)	28s
Min TF pre-commit (./examples/complete)	30s
Min TF pre-commit (./examples/with-vpc)	24s
Min TF pre-commit (./examples/simple)	25s
Min TF pre-commit (./examples/multiple-regions)	1s
Min TF pre-commit (./examples/runtimes)	28s
Min TF pre-commit (./examples/async)	30s
Min TF pre-commit (./examples/code-signing)	30s
Min TF pre-commit (./examples/simple-cicd)	25s
Min TF pre-commit (./examples/container-image)	32s
Min TF pre-commit (./examples/event-source-mapping)	30s
Min TF pre-commit (./examples/with-vpc-s3-endpoint)	33s
Min TF pre-commit (./examples/build-package)	31s
Min TF pre-commit (./examples/deploy)	24s
Min TF pre-commit (./examples/triggers)	28s
Min TF pre-commit (./examples/with-efs)	24s
	10m 46s

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