chore(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
babel-preset-gatsby	devDependencies	patch	0.4.7 -> 0.4.8
gatsby (changelog)	dependencies	minor	2.22.15 -> 2.23.1
gatsby-image	dependencies	patch	2.4.5 -> 2.4.6
gatsby-plugin-canonical-urls	dependencies	patch	2.3.2 -> 2.3.3
gatsby-plugin-layout	dependencies	patch	1.3.2 -> 1.3.3
gatsby-plugin-manifest	dependencies	patch	2.4.9 -> 2.4.10
gatsby-plugin-offline	dependencies	patch	3.2.7 -> 3.2.8
gatsby-plugin-react-helmet	dependencies	patch	3.3.2 -> 3.3.3
gatsby-plugin-sharp	dependencies	patch	2.6.9 -> 2.6.10
gatsby-plugin-sitemap	dependencies	patch	2.4.3 -> 2.4.4
gatsby-source-filesystem	dependencies	patch	2.3.8 -> 2.3.10
gatsby-transformer-sharp	dependencies	patch	2.5.3 -> 2.5.4

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Release Notes

gatsbyjs/gatsby

### [`v0.4.8`](https://togithub.com/gatsbyjs/gatsby/compare/e3c4efcbae6f5eab377a40bc88f45511f7c02c80...75f059efb1135362845bb347d2778cacfeb1454b) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/e3c4efcbae6f5eab377a40bc88f45511f7c02c80...75f059efb1135362845bb347d2778cacfeb1454b)

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Codecov Report

Merging #234 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   49.87%   49.87%           
=======================================
  Files          50       50           
  Lines         391      391           
  Branches       50       50           
=======================================
  Hits          195      195           
  Misses        165      165           
  Partials       31       31           

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