Revert "Bump @storybook/addon-a11y from 6.5.16 to 7.0.2"

[lsegurado]

What is the purpose of this pull request?

Screenshots or example usage

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Quality improvement (tests or refactors)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (small fix or feature that doesn't impact functionalities)
• Requires change to documentation, which has been updated accordingly