Bump sprockets-rails from 3.4.2 to 3.5.2 #318

Job	Run time
linting	26s
graphics-magick-tests	1m 16s
test (4, 0)	1m 45s
test (4, 1)	1m 48s
test (4, 2)	1m 44s
test (4, 3)	1m 22s
coverage	18s
build-and-deploy / build	0s
build-and-deploy / deploy-development	0s
build-and-deploy / deploy-staging	0s
build-and-deploy / notify-development	0s
build-and-deploy / notify-staging	0s
build-and-deploy / deploy-production	0s
build-and-deploy / notify-production	0s
build-and-deploy / notify-production-2	0s
	8m 39s

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