Update storybook monorepo to v5.2.8 (patch)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@storybook/addon-actions	devDependencies	patch	5.2.7 -> 5.2.8
@storybook/addon-links	devDependencies	patch	5.2.7 -> 5.2.8
@storybook/addon-notes	devDependencies	patch	5.2.7 -> 5.2.8
@storybook/addons	devDependencies	patch	5.2.7 -> 5.2.8
@storybook/angular	devDependencies	patch	5.2.7 -> 5.2.8
@storybook/cli	devDependencies	patch	5.2.7 -> 5.2.8

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Release Notes

storybookjs/storybook

### [`v5.2.8`](https://togithub.com/storybookjs/storybook/blob/master/CHANGELOG.md#​528-December-2-2019) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.2.7...v5.2.8) ##### Bug Fixes - UI: Fix layout of Preview container ([#​8628](https://togithub.com/storybookjs/storybook/pull/8628)) - Core: Use `stable` package to ensure story sorting is stable ([#​8795](https://togithub.com/storybookjs/storybook/pull/8795)) - Source-loader: Warn if applied to non-stories file ([#​8773](https://togithub.com/storybookjs/storybook/pull/8773))

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