Bump prismjs and @storybook/addon-actions

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


Removes `prismjs`

Updates `@storybook/addon-actions` from 5.2.8 to 6.5.15
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/v6.5.15/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v6.5.15/addons/actions)

---
updated-dependencies:
- dependency-name: prismjs
  dependency-type: indirect
- dependency-name: "@storybook/addon-actions"
  dependency-type: direct:development
...

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

Author: dependabot[bot]