chore(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
babel-preset-gatsby	devDependencies	patch	0.3.1 -> 0.3.3
gatsby (changelog)	dependencies	patch	2.20.18 -> 2.20.24
gatsby-image	dependencies	patch	2.3.2 -> 2.3.4
gatsby-plugin-canonical-urls	dependencies	patch	2.2.1 -> 2.2.3
gatsby-plugin-layout	dependencies	patch	1.2.1 -> 1.2.3
gatsby-plugin-manifest	dependencies	patch	2.3.3 -> 2.3.5
gatsby-plugin-offline	dependencies	patch	3.1.2 -> 3.1.4
gatsby-plugin-react-helmet	dependencies	patch	3.2.2 -> 3.2.4
gatsby-plugin-sharp	dependencies	patch	2.5.4 -> 2.5.6
gatsby-source-filesystem	dependencies	patch	2.2.2 -> 2.2.4
gatsby-transformer-sharp	dependencies	patch	2.4.4 -> 2.4.6

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Release Notes

gatsbyjs/gatsby

### [`v0.3.3`](https://togithub.com/gatsbyjs/gatsby/compare/v0.3.2...8b6b9f338b6d695a30c80ead459c3a9ca2f165e3) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/v0.3.2...8b6b9f338b6d695a30c80ead459c3a9ca2f165e3) ### [`v0.3.2`](https://togithub.com/gatsbyjs/gatsby/compare/v0.3.1...v0.3.2) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/v0.3.1...v0.3.2)

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[codecov[bot]]

Codecov Report

Merging #153 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #153   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines            8         8           
=========================================
  Hits             8         8           

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