chore(deps): update dependency gatsby to v3.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (changelog)	3.3.0 -> 3.3.1

---

Release Notes

gatsbyjs/gatsby

### [`v3.3.1`](https://togithub.com/gatsbyjs/gatsby/compare/fb92ede949f67c16a247ea5b0bc96934f0534dd2...96a8f2adaaeaf6551381a8abed549d65ed30b592) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@3.3.0...gatsby@3.3.1)

---

Configuration

:date: Schedule: "after 10pm every weekday,before 5am every weekday,every weekend" (UTC).

:vertical_traffic_light: Automerge: Enabled.

:recycle: Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

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

---

This PR has been generated by WhiteSource Renovate. View repository job log here.