Update dependency gulp to v3.9.0 - autoclosed

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gulp (source)	devDependencies	minor	3.8.11 -> 3.9.0

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	9.8	CVE-2021-44906	#32
High	9.1	CVE-2019-10744	#10
High	7.5	CVE-2016-10540	#8
Medium	5.6	CVE-2020-7598	#19

---

Release Notes

gulpjs/gulp

### [`v3.9.0`](https://togithub.com/gulpjs/gulp/blob/HEAD/CHANGELOG.md#​390) [Compare Source](https://togithub.com/gulpjs/gulp/compare/v3.8.11...v3.9.0) - add babel support - add transpiler fallback support - add support for some renamed transpilers: livescript, etc - add JSCS - update dependencies (liftoff, interpret) - documentation tweaks

---

• [ ] If you want to rebase/retry this PR, check this box