fix(deps): update dependency gatsby to v2.29.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (changelog)	2.28.2 -> 2.29.1

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Release Notes

gatsbyjs/gatsby

v2.29.1

Compare Source

v2.29.0

Compare Source

Welcome to gatsby@2.29.0 release (December 2020 #​2)

See full release notes

Key highlights of this release:

• Query on Demand - improves gatsby develop bootup time
• Lazy Images - do not wait for all images to be processed to start the development
• Improvements to our CLI - improved create-gatsby & new plugin command
• Experimental: Parallel data sourcing - run source plugins in parallel to speedup sourcing on sites with multiple source plugins

Other notable changes:

• Performance improvements
• Slugify option for File System Route API
• gatsby-image codemod
• Notable bugfixes

Bleeding Edge: Want to try new features as soon as possible? Install gatsby@next and let us know
if you have any issues.

Previous release notes
Full changelog

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