Bump gulp-eslint from 3.0.1 to 6.0.0

Bumps [gulp-eslint](https://github.com/adametry/gulp-eslint) from 3.0.1 to 6.0.0.
- [Release notes](https://github.com/adametry/gulp-eslint/releases)
- [Changelog](https://github.com/adametry/gulp-eslint/blob/master/CHANGELOG.md)
- [Commits](adametry/gulp-eslint@v3.0.1...v6.0.0)

---
updated-dependencies:
- dependency-name: gulp-eslint
  dependency-version: 6.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]