Update dependency gatsby to v2.26.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby (changelog)	dependencies	minor	2.25.3 -> 2.26.1

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Release Notes

gatsbyjs/gatsby

### [`v2.26.1`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.26.0...gatsby@2.26.1) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.26.0...gatsby@2.26.1) ### [`v2.26.0`](https://togithub.com/gatsbyjs/gatsby/releases/gatsby@2.26.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.25.4...gatsby@2.26.0) Welcome to `gatsby@2.26.0` release (November 2020). Key highlights of this release: - [New Image Plugin (beta)](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#gatsby-plugin-image010-beta) - access static images without GraphQL, high Lighthouse scores again - [File System Route API](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#file-system-route-api) - create routes from your data using filename conventions - [New Release Process](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#new-release-process) - more stability and clarity around Gatsby releases - [gatsby-source-contentful v4.0](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#gatsby-source-contentful400) - new RichText implementation, performance improvements Other notable changes: - [gatsby-plugin-mdx](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#gatsby-plugin-mdx140) - performance improvements - [Enable compression in the dev server](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#enable-compression-in-the-dev-server) - speeds up remote previews Sneak peek to next releases: - [Queries on Demand](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#queries-on-demand) - improves `gatsby develop` bootup time - [Experimental: Lazy images in develop](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#experimental-lazy-images-in-develop) - [Documentation Reorganization](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md#documentation-reorganization) **Bleeding Edge:** Want to try new features as soon as possible? Install `gatsby@next` and let us know if you have any [issues](https://togithub.com/gatsbyjs/gatsby/issues). [Full release notes](https://togithub.com/gatsbyjs/gatsby/blob/master/docs/reference/release-notes/v2.26/index.md) [Full changelog](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.26.0-next.0...gatsby@2.26.0) ### [`v2.25.4`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.25.3...gatsby@2.25.4) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.25.3...gatsby@2.25.4)

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