Update dependency gulp-size to v4 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-size	^3.0.0 -> ^4.0.0

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Release Notes

sindresorhus/gulp-size (gulp-size)

### [`v4.0.1`](https://togithub.com/sindresorhus/gulp-size/releases/tag/v4.0.1) [Compare Source](https://togithub.com/sindresorhus/gulp-size/compare/v4.0.0...v4.0.1) - Fix error caused by the absence of files when starting gulp task ([#​49](https://togithub.com/sindresorhus/gulp-size/issues/49)) [`3980cc9`](https://togithub.com/sindresorhus/gulp-size/commit/3980cc9) ### [`v4.0.0`](https://togithub.com/sindresorhus/gulp-size/releases/tag/v4.0.0) [Compare Source](https://togithub.com/sindresorhus/gulp-size/compare/v3.0.0...v4.0.0) ##### Breaking - Require Node.js 12 [`b022d53`](https://togithub.com/sindresorhus/gulp-size/commit/b022d53) - Require Gulp 4 [`f1eb869`](https://togithub.com/sindresorhus/gulp-size/commit/f1eb869) ##### Improvements - Add support for also displaying Brotli compressed size ([#​47](https://togithub.com/sindresorhus/gulp-size/issues/47)) [`e5200f1`](https://togithub.com/sindresorhus/gulp-size/commit/e5200f1) - Add support for also displaying uncompressed size ([#​47](https://togithub.com/sindresorhus/gulp-size/issues/47)) [`e5200f1`](https://togithub.com/sindresorhus/gulp-size/commit/e5200f1)

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