Bump acorn from 5.5.3 to 5.7.4 in /kb/ken-burns-carousel-master#2

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dependabot/npm_and_yarn/kb/ken-burns-carousel-master/acorn-5.7.493simon/93simon.github.io:dependabot/npm_and_yarn/kb/ken-burns-carousel-master/acorn-5.7.4Copy head branch name to clipboard