Bump gulp-mocha from 0.4.1 to 7.0.2

Bumps [gulp-mocha](https://github.com/sindresorhus/gulp-mocha) from 0.4.1 to 7.0.2.
- [Release notes](https://github.com/sindresorhus/gulp-mocha/releases)
- [Commits](sindresorhus/gulp-mocha@v0.4.1...v7.0.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

package.json

@@ -36,7 +36,7 @@
     "gulp": "~3.5.5",
     "gulp-coffee": "~1.4.1",
     "gulp-clean": "~0.4.0",
-    "gulp-mocha": "~0.4.1",
+    "gulp-mocha": "~7.0.2",
     "mocha": "~1.17.1",
     "chai": "~1.9.0",
     "sinon": "~1.9.0",