Bump braces, gulp and gulp-load-plugins

Bumps [braces](https://github.com/micromatch/braces) to 3.0.3 and updates ancestor dependencies [braces](https://github.com/micromatch/braces), [gulp](https://github.com/gulpjs/gulp) and [gulp-load-plugins](https://github.com/jackfranklin/gulp-load-plugins). These dependencies need to be updated together.


Updates `braces` from 3.0.2 to 3.0.3
- [Changelog](https://github.com/micromatch/braces/blob/master/CHANGELOG.md)
- [Commits](https://github.com/micromatch/braces/compare/3.0.2...3.0.3)

Updates `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](https://github.com/gulpjs/gulp/compare/v4.0.2...v5.0.0)

Updates `gulp-load-plugins` from 1.6.0 to 2.0.8
- [Release notes](https://github.com/jackfranklin/gulp-load-plugins/releases)
- [Commits](https://github.com/jackfranklin/gulp-load-plugins/compare/1.6.0...v2.0.8)

---
updated-dependencies:
- dependency-name: braces
  dependency-type: indirect
- dependency-name: gulp
  dependency-type: direct:development
- dependency-name: gulp-load-plugins
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -39,11 +39,11 @@
   },
   "devDependencies": {
     "fs-extra": "^0.26.7",
-    "gulp": "^4.0.2",
+    "gulp": "^5.0.0",
     "gulp-changed": "^3.2.0",
     "gulp-clean-css": "^3.10.0",
     "gulp-debug": "^4.0.0",
-    "gulp-load-plugins": "^1.6.0",
+    "gulp-load-plugins": "^2.0.8",
     "gulp-notify": "^3.2.0",
     "gulp-plumber": "^1.2.1",
     "gulp-rename": "^1.4.0",