chore(deps): bump ejs and @storybook/addon-storyshots

Removes [ejs](https://github.com/mde/ejs). It's no longer used after updating ancestor dependency [@storybook/addon-storyshots](https://github.com/storybookjs/storybook/tree/HEAD/addons/storyshots/storyshots-core). These dependencies need to be updated together.


Removes `ejs`

Updates `@storybook/addon-storyshots` from 5.3.21 to 6.5.12
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/v6.5.12/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v6.5.12/addons/storyshots/storyshots-core)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
- dependency-name: "@storybook/addon-storyshots"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]