Update gatsby monorepo

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
babel-preset-gatsby	0.12.1 -> 0.12.2
gatsby (changelog)	2.32.4 -> 2.32.6
gatsby-cli	2.19.1 -> 2.19.2
gatsby-plugin-manifest	2.12.0 -> 2.12.1
gatsby-plugin-offline	3.10.1 -> 3.10.2
gatsby-plugin-sharp	2.14.1 -> 2.14.2
gatsby-remark-images	3.11.0 -> 3.11.1
gatsby-source-filesystem	2.11.0 -> 2.11.1
gatsby-transformer-remark	2.16.0 -> 2.16.1

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Release Notes

gatsbyjs/gatsby

v0.12.2

Compare Source

• eslint-plugin-jsx-a11y added a peerDependency on a patch update which meant NPM 2 users couldn't install Gatsby or starters. #​369 pins the plugin to the last good release.
• @​kennu fixed an instance where we were hiding important errors #​366

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