Update dependency gulp-mocha to v7

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gulp-mocha	devDependencies	major	6.0.0 -> 7.0.1

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Release Notes

sindresorhus/gulp-mocha

v7.0.1

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• Fix regressions in v7 (#​197) f60a346

v7.0.0

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Breaking:

• Update Mocha (release notes) 4924437
• Require Node.js 8 and Gulp 4 4924437

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