[Snyk] Security upgrade @stryker-mutator/core from 2.0.0 to 4.2.0#18

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-8779e2def1167c744bfc7879f6c21ee2

+1-1

Commits on Apr 10, 2021

fix: package.json & yarn.lock to reduce vulnerabilities
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