[Snyk] Security upgrade ts-jest from 24.3.0 to 25.3.0#43

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-6994aff5ab6e247004c8d424969295bb

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Commits on Jul 18, 2020

fix: packages/@vuepress/test-utils/package.json to reduce vulnerabilities
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