chore(deps): bump markdown-to-jsx and @storybook/addon-knobs

Bumps [markdown-to-jsx](https://github.com/quantizor/markdown-to-jsx) to 7.5.0 and updates ancestor dependency [@storybook/addon-knobs](https://github.com/storybookjs/addon-knobs). These dependencies need to be updated together.


Updates `markdown-to-jsx` from 7.1.5 to 7.5.0
- [Release notes](https://github.com/quantizor/markdown-to-jsx/releases)
- [Changelog](https://github.com/quantizor/markdown-to-jsx/blob/main/CHANGELOG.md)
- [Commits](quantizor/markdown-to-jsx@7.1.5...v7.5.0)

Updates `@storybook/addon-knobs` from 6.1.21 to 6.4.0
- [Release notes](https://github.com/storybookjs/addon-knobs/releases)
- [Changelog](https://github.com/storybookjs/addon-knobs/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/addon-knobs/commits/v6.4.0)

---
updated-dependencies:
- dependency-name: markdown-to-jsx
  dependency-type: indirect
- dependency-name: "@storybook/addon-knobs"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>