Fix the squish

[Jeremy-Walton]

Task

Fixes #310

Why?

When a divider was used inside a flex container with a fixed width or height, the width or height would get ignored and the divider would squish.

What Changed

• Add min block size to match height
• Add min inline size to match width for vertical variant

Quality Assurance

• Have you tagged the PR with the correct labels?
• Have you validated the changes?
  • Have you run linters? (yarn sanity-check)
  • Have you run prettier?
  • Have you tried building the css?
  • Have you tried building storybook?
• [ ] Have you updated any usage of changed tokens?
• [ ] Did you add a component?
  • [ ] Have you added it to the dependency graph?
  • [ ] Have you added it to the docs?
• Did you update a component?
  • [ ] Have you updated the dependency graph?
  • [ ] Have you updated the docs?
• [ ] Do you need to update the package version?

Screenshots