fix: activate venv in publish_pypi.sh #902

Job	Run time
build	1m 9s
system-tests / Get parameters / Get parameters	1m 27s
system-tests / Build end-to-end (apigw-rest)	56s
system-tests / Build end-to-end (function-url)	52s
system-tests / Build end-to-end (alb-multi)	51s
system-tests / Build end-to-end (apigw-http)	1m 0s
system-tests / Build end-to-end (alb)	55s
system-tests / parametric	0s
system-tests / End-to-end #1 / alb-multi 1	3m 6s
system-tests / End-to-end #1 / alb 1	2m 42s
system-tests / End-to-end #1 / apigw-http 1	3m 6s
system-tests / End-to-end #1 / function-url 1	3m 14s
system-tests / End-to-end #1 / apigw-rest 1	3m 0s
	22m 18s

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