Bump @types/gulp from 4.0.15 to 4.0.16

Bumps [@types/gulp](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/gulp) from 4.0.15 to 4.0.16.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/gulp)

---
updated-dependencies:
- dependency-name: "@types/gulp"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -90,7 +90,7 @@
     "@types/ejs": "^3.1.3",
     "@types/express": "^4.17.19",
     "@types/express-session": "^1.17.8",
-    "@types/gulp": "^4.0.15",
+    "@types/gulp": "^4.0.16",
     "@types/gulp-changed": "^0.0.37",
     "@types/gulp-minify": "^3.1.3",
     "@types/gulp-sass": "^5.0.2",