chore(deps-dev): bump storybook in /packages/slice-machine

Bumps [storybook](https://github.com/storybookjs/storybook/tree/HEAD/code/core) from 7.1.0 to 7.6.21.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v7.6.21/code/core)

---
updated-dependencies:
- dependency-name: storybook
  dependency-version: 7.6.21
  dependency-type: direct:development
...

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

Author: dependabot[bot]

packages/slice-machine/package.json

@@ -120,7 +120,7 @@
     "redux-persist": "6.0.0",
     "remark-gfm": "3.0.1",
     "semver": "7.3.8",
-    "storybook": "7.1.0",
+    "storybook": "7.6.21",
     "stylelint": "16.2.0",
     "stylelint-config-css-modules": "4.4.0",
     "stylelint-config-recommended": "14.0.0",