chore: enable build_layers.sh to build from specific dd-trace-py commit #402

Job	Run time
build	1m 10s
system-tests / Get parameters / Get parameters	24s
system-tests / Build end-to-end (apigw-http)	1m 12s
system-tests / Build end-to-end (alb)	1m 16s
system-tests / Build end-to-end (alb-multi)	1m 17s
system-tests / Build end-to-end (apigw-rest)	1m 14s
system-tests / Build end-to-end (function-url)	1m 17s
system-tests / parametric	0s
system-tests / End-to-end #1 / apigw-rest 1	2m 49s
system-tests / End-to-end #1 / apigw-http 1	4m 4s
system-tests / End-to-end #1 / function-url 1	2m 37s
system-tests / End-to-end #1 / alb-multi 1	2m 37s
system-tests / End-to-end #1 / alb 1	5m 0s
system-tests / Report failures	0s
	24m 57s

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