chore(deps): update storybook to v5.3.19

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change
@storybook/addon-storyshots	patch	devDependencies	5.3.18 -> 5.3.19
@storybook/addon-viewport	patch	devDependencies	5.3.18 -> 5.3.19
@storybook/react	patch	devDependencies	5.3.18 -> 5.3.19

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Release Notes

storybookjs/storybook

### [`v5.3.19`](https://togithub.com/storybookjs/storybook/blob/master/CHANGELOG.md#​5319-May-24-2020) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.3.18...v5.3.19) ##### Bug Fixes - UI: Fix search stories ([#​10539](https://togithub.com/storybookjs/storybook/pull/10539)) ##### Security - Upgrade markdown-to-jsx to 6.11.4 ([#​10873](https://togithub.com/storybookjs/storybook/pull/10873))

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