[frontend] Update sprockets to version 3.7.2
This is needed to address CVE-2018-3760. https://groups.google.com/forum/#!topic/rubyonrails-security/ft_J--l55fM
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This is needed to address CVE-2018-3760. https://groups.google.com/forum/#!topic/rubyonrails-security/ft_J--l55fM