Update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby	dependencies	patch	2.17.11 -> 2.17.12
gatsby-image	dependencies	patch	2.2.31 -> 2.2.32
gatsby-plugin-offline	dependencies	patch	3.0.19 -> 3.0.20
gatsby-plugin-sharp	dependencies	patch	2.2.37 -> 2.2.38
gatsby-transformer-remark	dependencies	patch	2.6.33 -> 2.6.34
gatsby-transformer-sharp	dependencies	patch	2.3.3 -> 2.3.4

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Release Notes

gatsbyjs/gatsby

### [`v2.17.12`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.11...gatsby@2.17.12) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.11...gatsby@2.17.12)

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[codecov[bot]]

Codecov Report

Merging #346 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #346   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines          60     60           
  Branches       10     10           
=====================================
  Hits           60     60

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