chore(deps): update storybook to v5.3.13

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
@storybook/addon-storyshots	patch	devDependencies	5.3.12 -> 5.3.13
@storybook/addon-viewport	patch	devDependencies	5.3.12 -> 5.3.13
@storybook/react	patch	devDependencies	5.3.12 -> 5.3.13

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Release Notes

storybookjs/storybook

### [`v5.3.13`](https://togithub.com/storybookjs/storybook/blob/master/CHANGELOG.md#​5313-February-12-2020) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.3.12...v5.3.13) ##### Bug Fixes - React: Remove `MiniCssExtractPlugin` for CRA ([#​9759](https://togithub.com/storybookjs/storybook/pull/9759)) ##### Maintenance - Build: Fix DLL generation race condition ([#​9770](https://togithub.com/storybookjs/storybook/pull/9770))

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