Update dependency gulp-ejs to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
gulp-ejs	devDependencies	major	^3.1.3 -> ^4.0.0	source

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Release Notes

rogeriopvl/gulp-ejs

### [`v4.0.0`](https://togithub.com/rogeriopvl/gulp-ejs/blob/master/CHANGELOG.md#v400) [Compare Source](https://togithub.com/rogeriopvl/gulp-ejs/compare/v3.3.0...v4.0.0) This version features a complete rewrite of the plugin to update it's code to modern es6 javascript, which involve some breaking changes. - Removed settings hash (third argument), consequentially `settings.ext` (setting output file extension) is no longer supported. If you need to rename the ejs files extension please use [gulp-rename](https://npmjs.com/package/gulp-rename). - Renamed exposed `ejs` object to `__EJS__` Please check the [README](https://togithub.com/rogeriopvl/gulp-ejs/blob/master/README.md) file for more info on how migrate to version 4.

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