Update dependency gulp-merge-json to v2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gulp-merge-json	devDependencies	major	^1.3.1 -> ^2.0.0

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Release Notes

joshswan/gulp-merge-json

### [`v2.1.0`](https://togithub.com/joshswan/gulp-merge-json/releases/v2.1.0) [Compare Source](https://togithub.com/joshswan/gulp-merge-json/compare/v2.0.0...v2.1.0) ##### Features - add transform function option for editing merged object ([9aae9bd](https://togithub.com/joshswan/gulp-merge-json/commit/9aae9bd6d4a815f9b9002acc3cd95bedd765ddcd)) ### [`v2.0.0`](https://togithub.com/joshswan/gulp-merge-json/releases/v2.0.0) [Compare Source](https://togithub.com/joshswan/gulp-merge-json/compare/1.3.1...v2.0.0) ##### ⚠ BREAKING CHANGES - Multiple options arguments and edit object support have been removed ##### Code Refactoring - remove deprecated functionality and simplified code ([f6260c3](https://togithub.com/joshswan/gulp-merge-json/commit/f6260c32edddd15371dfe38680050ba263d93f8b))

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