build(deps-dev): bump @types/gulp from 4.0.14 to 4.0.15

Bumps [@types/gulp](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/gulp) from 4.0.14 to 4.0.15.
- [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] <[email protected]>

package.json

@@ -37,7 +37,7 @@
     "@iobroker/testing": "^4.1.0",
     "@types/chai": "^4.3.7",
     "@types/chai-as-promised": "^7.1.6",
-    "@types/gulp": "^4.0.14",
+    "@types/gulp": "^4.0.15",
     "@types/mocha": "^10.0.2",
     "@types/node": "^20.8.4",
     "@types/proxyquire": "^1.3.29",