Save pin-16.svg, pin-slash-16.svg, pin-24.svg, pin-slash-24.svg

[CameronFoxly]

This PR adds pin-slash (alt keyword unpin) and flips the orientation of our current pin icon to make them work together. Discussion in this issue.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 71e0f88a7cc510fdc3d8514696a9d3702e08068a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | @primer/octicons | Minor |

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[colebemis]

@CameronFoxly I think you need to remove the frame background in Figma. When the SVG optimizer runs, the frame background turns into a black square:

[CameronFoxly]

Thanks for the headsup @colebemis. Should be good now!