fix: improve path traversal #1075

Job	Run time
build (javascript/express)	2m 5s
build (javascript/hapi)	17s
build (javascript/lang)	3m 13s
build (javascript/node)	12s
build (javascript/react)	56s
build (javascript/third_parties)	1m 49s
build (ruby/lang)	4m 8s
build (ruby/rails)	1m 37s
build (ruby/third_parties)	3m 18s
build (java/lang)	3m 0s
build (java/spring)	14s
build (java/android)	14s
build (java/third_parties)	31s
build (php/lang)	5m 3s
build (php/symfony)	54s
build (php/third_parties)	1m 5s
build (python/lang)	31s
build (go/lang)	57s
build (go/gosec)	2m 9s
build (go/gorilla)	14s
	32m 27s

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