Update dep @artsy/palette from 5.1.11 to v5.1.12

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@artsy/palette	dependencies	patch	5.1.11 -> 5.1.12

See full list of changes here.

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Release Notes

artsy/palette

### [`v5.1.12`](https://togithub.com/artsy/palette/blob/master/CHANGELOG.md#v5112-Mon-Dec-23-2019) [Compare Source](https://togithub.com/artsy/palette/compare/v5.1.11...v5.1.12) ##### 🐛 Bug Fix - `@artsy/palette` - [@​mzikherman](https://togithub.com/mzikherman) => [Modal] Add option to disable forcing scrollbars for smaller content [#​623](https://togithub.com/artsy/palette/pull/623) ([@​mzikherman](https://togithub.com/mzikherman)) ##### Authors: 1 - Matt Zikherman ([@​mzikherman](https://togithub.com/mzikherman)) * * *

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[artsyit]

:rocket: PR was released in v1.20.5 :rocket: