Update mark-github-24 sizing

[durfee]

This PR fixes a sizing issue of the GitHub mark (see below)

Here's a before/after

Old is in purple, new is in grey.

[changeset-bot]

⚠️ No Changeset found

Latest commit: a2decdc

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[durfee]

Following up with the branch feedback in Figma

[camertron]

Wait sorry, why is the markdown icon being deleted?

[durfee]

Oh goodness my bad, I copy pasted over the wrong one 🙈 Uploading the correct change in a moment

[camertron]

Thank you!