[7.x] Upgrade mocha dev-dependency from 6.2.2 to 7.1.1 (#60779)#61064

Merged

watson merged 1 commit intoelastic:7.xfrom watson:backport/7.x/pr-60779

Mar 24, 2020

+111-134

Commits on Mar 24, 2020

Upgrade mocha dev-dependency from 6.2.2 to 7.1.1 (elastic#60779 )

watson
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spalger
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