chore(deps): update dependency gulp-mocha to v7 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
gulp-mocha	devDependencies	major	^5.0.0 -> ^7.0.0

By merging this PR, the below vulnerabilities will be automatically resolved:

	Severity	CVSS Score	CVE
	High	7.1	WS-2018-0590
	Medium	5.6	CVE-2020-7598
	Medium	5.3	WS-2019-0425

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Release Notes

sindresorhus/gulp-mocha

### [`v7.0.0`](https://togithub.com/sindresorhus/gulp-mocha/releases/v7.0.0) [Compare Source](https://togithub.com/sindresorhus/gulp-mocha/compare/v6.0.0...v7.0.0) Breaking: - Update Mocha ([release notes](https://togithub.com/mochajs/mocha/releases/tag/v6.0.0)) [`4924437`](https://togithub.com/sindresorhus/gulp-mocha/commit/4924437) - Require Node.js 8 and Gulp 4 [`4924437`](https://togithub.com/sindresorhus/gulp-mocha/commit/4924437) ### [`v6.0.0`](https://togithub.com/sindresorhus/gulp-mocha/compare/v5.0.0...v6.0.0) [Compare Source](https://togithub.com/sindresorhus/gulp-mocha/compare/v5.0.0...v6.0.0)

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