chore(deps): update storybook to v5.3.12

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
@storybook/addon-storyshots	patch	devDependencies	5.3.10 -> 5.3.12
@storybook/addon-viewport	patch	devDependencies	5.3.10 -> 5.3.12
@storybook/react	patch	devDependencies	5.3.10 -> 5.3.12

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Release Notes

storybookjs/storybook

### [`v5.3.12`](https://togithub.com/storybookjs/storybook/blob/master/CHANGELOG.md#​5312-February-5-2020) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.3.11...v5.3.12) ##### Bug Fixes - Core: Fix dev server error - back out bad change ([#​9753](https://togithub.com/storybookjs/storybook/pull/9753)) ### [`v5.3.11`](https://togithub.com/storybookjs/storybook/blob/master/CHANGELOG.md#​5311-February-4-2020) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.3.10...v5.3.11) ##### Bug Fixes - Svelte: Fix Svelte 3 slots for decorators ([#​9724](https://togithub.com/storybookjs/storybook/pull/9724)) - CLI: Fix file path for Button story ([#​9325](https://togithub.com/storybookjs/storybook/pull/9325)) - Angular: Emit decorator metadata by default ([#​9701](https://togithub.com/storybookjs/storybook/pull/9701)) - Storyshots: Fix config via main.ts ([#​9577](https://togithub.com/storybookjs/storybook/pull/9577))

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