[Snyk] Security upgrade mocha from 5.0.4 to 7.1.1#26

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-914912a37afa8393b2d2c467e3c0e01b

+738-53

Commits on Mar 19, 2020

fix: test/fixtures/wpt/resources/webidl2/package.json & test/fixtures/wpt/resources/webidl2/package-lock.json to reduce vulnerabilities
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