chore(deps): update storybook

This MR contains the following updates:

Package	Type	Update	Change
@storybook/addon-a11y	devDependencies	patch	6.3.6 -> 6.3.9
@storybook/addon-docs	devDependencies	patch	6.3.6 -> 6.3.9
@storybook/addon-essentials	devDependencies	patch	6.3.6 -> 6.3.9
@storybook/addon-knobs	devDependencies	minor	6.2.9 -> 6.3.1
@storybook/addon-storyshots	devDependencies	patch	6.3.6 -> 6.3.9
@storybook/addon-storyshots-puppeteer	devDependencies	patch	6.3.6 -> 6.3.9
@storybook/addon-viewport	devDependencies	patch	6.3.6 -> 6.3.9
@storybook/theming	devDependencies	patch	6.3.6 -> 6.3.9
@storybook/vue	devDependencies	patch	6.3.6 -> 6.3.9

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

storybookjs/storybook

v6.3.9

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v6.3.8

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v6.3.7

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storybookjs/addon-knobs

v6.3.1

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v6.3.0

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