Update storybook monorepo to v5.1.8 (patch)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@storybook/addon-actions	devDependencies	patch	5.1.5 -> 5.1.8
@storybook/addon-links	devDependencies	patch	5.1.5 -> 5.1.8
@storybook/addon-notes	devDependencies	patch	5.1.5 -> 5.1.8
@storybook/addons	devDependencies	patch	5.1.5 -> 5.1.8
@storybook/angular	devDependencies	patch	5.1.5 -> 5.1.8
@storybook/cli	devDependencies	patch	5.1.5 -> 5.1.8

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Release Notes

storybookjs/storybook

### [`v5.1.8`](https://togithub.com/storybookjs/storybook/releases/v5.1.8) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.1.7...v5.1.8) ##### Bug Fixes - CLI: Fix RN template to not import addons ([#​7096](https://togithub.com/storybookjs/storybook/pull/7096)) ### [`v5.1.7`](https://togithub.com/storybookjs/storybook/releases/v5.1.7) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.1.6...v5.1.7) ##### Bug Fixes - UI: Fix warning of loading prop not being a string ([#​7080](https://togithub.com/storybookjs/storybook/pull/7080)) ### [`v5.1.6`](https://togithub.com/storybookjs/storybook/compare/v5.1.5...v5.1.6) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.1.5...v5.1.6)

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