Pull in earlier versions of packages that are expecting Gatsby 3 for now.

[aManNamedJed]

I haven't noticed any issue, but during gatsby build, I am seeing this:

warn Plugin gatsby-transformer-json is not compatible with your gatsby version 2.32.13 - It requires gatsby@^3.0.0-next.0
warn Plugin gatsby-plugin-sass is not compatible with your gatsby version 2.32.13 - It requires gatsby@^3.0.0-next.0
warn Plugin gatsby-plugin-google-tagmanager is not compatible with your gatsby version 2.32.13 - It requires gatsby@^3.0.0-next.0

We may need to roll those back to previous versions in this release, with the hopes of just upgrading to Gatsby 3 ASAP.