fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANSIREGEX-1583908
- https://snyk.io/vuln/SNYK-JS-GLOBPARENT-1016905
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660

Author: snyk-bot

package.json

@@ -27,7 +27,7 @@
     "through2": "^2.0.3"
   },
   "devDependencies": {
-    "gulp": "^4.0.2",
+    "gulp": "^5.0.0",
     "gulp-jshint": "^2.1.0"
   },
   "peerDependencies": {