fix: IconButton dev stories - make target size 24x24 px

[francinelucca]

Closes https://github.com/github/primer/issues/3424

Changelog

Changed

• Update Dev-Only "Custom Size" and "Custom Size With Media" Storybook stories' button size to 24x24 for a11y compliance

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Storybook only change, not relevant to deployed package.

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

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Latest commit: b910da6

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	96.54 KB (0%)
packages/react/dist/browser.umd.js	96.82 KB (0%)

[siddharthkp]

Love to see it!

Approved, merge whenever you'd like