chore(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
babel-preset-gatsby	devDependencies	patch	0.4.10 -> 0.4.12
gatsby (changelog)	dependencies	patch	2.23.7 -> 2.23.12
gatsby-image	dependencies	patch	2.4.7 -> 2.4.9
gatsby-plugin-canonical-urls	dependencies	patch	2.3.4 -> 2.3.6
gatsby-plugin-layout	dependencies	patch	1.3.4 -> 1.3.6
gatsby-plugin-manifest	dependencies	patch	2.4.12 -> 2.4.14
gatsby-plugin-offline	dependencies	patch	3.2.11 -> 3.2.13
gatsby-plugin-react-helmet	dependencies	patch	3.3.4 -> 3.3.6
gatsby-plugin-sharp	dependencies	patch	2.6.12 -> 2.6.14
gatsby-plugin-sitemap	dependencies	patch	2.4.5 -> 2.4.7
gatsby-source-filesystem	dependencies	patch	2.3.12 -> 2.3.14
gatsby-transformer-sharp	dependencies	patch	2.5.5 -> 2.5.7

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Release Notes

gatsbyjs/gatsby

### [`v0.4.12`](https://togithub.com/gatsbyjs/gatsby/compare/934e51691b29d55bbad8094175b6d9d71337bd61...0005a1f2c905e4037aa9815605360688767b5e2e) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/934e51691b29d55bbad8094175b6d9d71337bd61...0005a1f2c905e4037aa9815605360688767b5e2e) ### [`v0.4.11`](https://togithub.com/gatsbyjs/gatsby/compare/b95439c0dbce9c1434278a4800b51bed5d17116a...934e51691b29d55bbad8094175b6d9d71337bd61) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/b95439c0dbce9c1434278a4800b51bed5d17116a...934e51691b29d55bbad8094175b6d9d71337bd61)

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[codecov[bot]]

Codecov Report

Merging #255 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #255   +/-   ##
=======================================
  Coverage   53.76%   53.76%           
=======================================
  Files          49       49           
  Lines         385      385           
  Branches       42       42           
=======================================
  Hits          207      207           
  Misses        150      150           
  Partials       28       28           

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