chore(deps): update dependency gatsby to v2.30.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (changelog)	2.30.2 -> 2.30.3

---

Release Notes

gatsbyjs/gatsby

### [`v2.30.3`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.2...gatsby@2.30.3) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.2...gatsby@2.30.3)

---

Renovate 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.