Different screenshots when upgrading Cypress from v6 to v7

[denieler]

Our project generates different screenshots on happo when we use Cypress v6 and v7. We use Cypress component testing and do make happo screenshots from there.

The only thing that changed - we followed Cypress migration guide - https://docs.cypress.io/guides/references/migration-guide#Migrating-to-Cypress-7-0. We didn't change happo or happo-cypress packages.