Bump gulp from 4.0.2 to 5.0.0

Bumps [gulp](https://github.com/gulpjs/gulp) from 4.0.2 to 5.0.0.
- [Release notes](https://github.com/gulpjs/gulp/releases)
- [Changelog](https://github.com/gulpjs/gulp/blob/master/CHANGELOG.md)
- [Commits](gulpjs/gulp@v4.0.2...v5.0.0)

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

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

package.json

@@ -21,7 +21,7 @@
   },
   "homepage": "https://bitbucket.org/feedmycode/lsx-testimonials#readme",
   "devDependencies": {
-    "gulp": "^4.0.2",
+    "gulp": "^5.0.0",
     "gulp-rtlcss": "^2.0.0",
     "gulp-autoprefixer": "^9.0.0",
     "gulp-concat": "^2.6.1",