release: update `Shopify/homenbrew-shopify`

This formula exists: https://github.com/Shopify/homebrew-shopify/blob/master/ejson.rb

GoReleaser supports updating brew formula: https://goreleaser.com/customization/homebrew/
We use GoReleaser.

We should configure GoReleaser to open a PR that updates the formula when a new version is released.