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: b7439a6

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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!

[github-actions]

Hi! This pull request has been marked as stale because it has been open with no activity for 60 days. You can comment on the pull request or remove the stale label to keep it open. If you do nothing, this pull request will be closed in 7 days.

[CameronFoxly]

LGTM!