fix(deps): update dependency gatsby-transformer-sharp to v2.3.16

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby-transformer-sharp	dependencies	patch	2.3.15 -> 2.3.16

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Release Notes

gatsbyjs/gatsby

### [`v2.3.16`](https://togithub.com/gatsbyjs/gatsby/compare/aef59ee77f96a14a32caab004c7c721b9b143ad0...73f4c6044805c144df8c40ce8c5e124291795478) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/aef59ee77f96a14a32caab004c7c721b9b143ad0...73f4c6044805c144df8c40ce8c5e124291795478)

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