Bump gulp-chmod from 3.0.0 to 4.0.0

Bumps [gulp-chmod](https://github.com/sindresorhus/gulp-chmod) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/sindresorhus/gulp-chmod/releases)
- [Commits](sindresorhus/gulp-chmod@v3.0.0...v4.0.0)

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

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

package.json

@@ -53,7 +53,7 @@
     "babel-loader": "^8.3.0",
     "del": "^5.0.0",
     "gulp": "^4.0.2",
-    "gulp-chmod": "^3.0.0",
+    "gulp-chmod": "^4.0.0",
     "gulp-clone": "^2.0.1",
     "gulp-iconfont": "^11.0.1",
     "gulp-rename": "^2.0.0",