chore(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
babel-preset-gatsby	devDependencies	patch	0.4.1 -> 0.4.2
gatsby (changelog)	dependencies	patch	2.21.21 -> 2.21.33
gatsby-plugin-manifest	dependencies	patch	2.4.2 -> 2.4.3
gatsby-plugin-offline	dependencies	patch	3.2.1 -> 3.2.2
gatsby-plugin-sharp	dependencies	patch	2.6.2 -> 2.6.3
gatsby-source-filesystem	dependencies	patch	2.3.1 -> 2.3.3

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Release Notes

gatsbyjs/gatsby

### [`v0.4.2`](https://togithub.com/gatsbyjs/gatsby/compare/96a8f2adaaeaf6551381a8abed549d65ed30b592...v0.4.2) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/96a8f2adaaeaf6551381a8abed549d65ed30b592...v0.4.2)

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Codecov Report

Merging #196 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #196   +/-   ##
=======================================
  Coverage   28.45%   28.45%           
=======================================
  Files          22       22           
  Lines         246      246           
  Branches       30       30           
=======================================
  Hits           70       70           
  Misses        157      157           
  Partials       19       19           

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