fix(starters): update gatsby monorepo (#12925)

This PR contains the following updates:

| Package | Type | Update | Change | References |
|---|---|---|---|---|
| gatsby | dependencies | patch | [`^2.3.3` -> `^2.3.5`](https://diff.intrinsic.com/gatsby/2.3.3/2.3.5) | [source](https://togithub.com/gatsbyjs/gatsby) |
| gatsby-image | dependencies | patch | [`^2.0.35` -> `^2.0.37`](https://diff.intrinsic.com/gatsby-image/2.0.35/2.0.37) | [source](https://togithub.com/gatsbyjs/gatsby) |
| gatsby-plugin-manifest | dependencies | patch | [`^2.0.25` -> `^2.0.26`](https://diff.intrinsic.com/gatsby-plugin-manifest/2.0.25/2.0.26) | [source](https://togithub.com/gatsbyjs/gatsby) |

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### Release Notes

<details>
<summary>gatsbyjs/gatsby</summary>

### [`v2.3.5`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.3.4...gatsby@2.3.5)

[Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.3.4...gatsby@2.3.5)

### [`v2.3.4`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.3.3...gatsby@2.3.4)

[Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.3.3...gatsby@2.3.4)

</details>

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