fix(deps): update gatsby monorepo

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (source, changelog)	`5.5.0` -> `5.6.0`
gatsby-plugin-feed (source)	`5.5.0` -> `5.6.0`
gatsby-plugin-image (source)	`3.5.0` -> `3.6.0`
gatsby-plugin-manifest (source)	`5.5.0` -> `5.6.0`
gatsby-plugin-sharp (source)	`5.5.0` -> `5.6.0`
gatsby-remark-images (source)	`7.5.0` -> `7.6.0`
gatsby-remark-prismjs (source)	`7.5.0` -> `7.6.0`
gatsby-remark-responsive-iframe (source)	`6.5.0` -> `6.6.0`
gatsby-source-filesystem (source)	`5.5.0` -> `5.6.0`
gatsby-transformer-remark (source)	`6.5.0` -> `6.6.0`
gatsby-transformer-sharp (source)	`5.5.0` -> `5.6.0`

Release Notes

gatsbyjs/gatsby (gatsby)

### [`v5.6.0`](https://togithub.com/gatsbyjs/gatsby/releases/tag/gatsby%405.6.0): v5.6.0 [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@5.5.0...gatsby@5.6.0) Welcome to `gatsby@5.6.0` release (February 2023 #1) Key highlights of this release: - [Gatsby is joining Netlify](https://www.gatsbyjs.com/docs/reference/release-notes/v5.6/#gatsby-is-joining-netlify) - [Head API supports context providers from `wrapRootElement`](https://www.gatsbyjs.com/docs/reference/release-notes/v5.6/#head-api-supports-context-providers-from-wraprootelement) **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). [Previous release notes](https://www.gatsbyjs.com//docs/reference/release-notes/v5.5) [Full changelog](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@5.6.0-next.0...gatsby@5.6.0)

gatsbyjs/gatsby (gatsby-plugin-feed)

### [`v5.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-feed@5.5.0...gatsby-plugin-feed@5.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-feed@5.5.0...gatsby-plugin-feed@5.6.0)

gatsbyjs/gatsby (gatsby-plugin-image)

### [`v3.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-image@3.5.0...gatsby-plugin-image@3.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-image@3.5.0...gatsby-plugin-image@3.6.0)

gatsbyjs/gatsby (gatsby-plugin-manifest)

### [`v5.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-manifest@5.5.0...gatsby-plugin-manifest@5.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-manifest@5.5.0...gatsby-plugin-manifest@5.6.0)

gatsbyjs/gatsby (gatsby-plugin-sharp)

### [`v5.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-sharp@5.5.0...gatsby-plugin-sharp@5.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-sharp@5.5.0...gatsby-plugin-sharp@5.6.0)

gatsbyjs/gatsby (gatsby-remark-images)

### [`v7.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-remark-images@7.5.0...gatsby-remark-images@7.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-remark-images@7.5.0...gatsby-remark-images@7.6.0)

gatsbyjs/gatsby (gatsby-remark-prismjs)

### [`v7.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-remark-prismjs@7.5.0...gatsby-remark-prismjs@7.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-remark-prismjs@7.5.0...gatsby-remark-prismjs@7.6.0)

gatsbyjs/gatsby (gatsby-remark-responsive-iframe)

### [`v6.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-remark-responsive-iframe@6.5.0...gatsby-remark-responsive-iframe@6.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-remark-responsive-iframe@6.5.0...gatsby-remark-responsive-iframe@6.6.0)

gatsbyjs/gatsby (gatsby-source-filesystem)

### [`v5.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-source-filesystem@5.5.0...gatsby-source-filesystem@5.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-source-filesystem@5.5.0...gatsby-source-filesystem@5.6.0)

gatsbyjs/gatsby (gatsby-transformer-remark)

### [`v6.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-transformer-remark@6.5.0...gatsby-transformer-remark@6.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-transformer-remark@6.5.0...gatsby-transformer-remark@6.6.0)

gatsbyjs/gatsby (gatsby-transformer-sharp)

### [`v5.6.0`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-transformer-sharp@5.5.0...gatsby-transformer-sharp@5.6.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-transformer-sharp@5.5.0...gatsby-transformer-sharp@5.6.0)

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