chore(deps-dev): bump @storybook/addon-a11y in /storybook

Bumps [@storybook/addon-a11y](https://github.com/storybookjs/storybook/tree/HEAD/addons/a11y) from 6.4.14 to 6.4.17.
- [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/v6.4.17/addons/a11y)

---
updated-dependencies:
- dependency-name: "@storybook/addon-a11y"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

storybook/package.json

@@ -15,7 +15,7 @@
     "react-dom": "^17.0.2"
   },
   "devDependencies": {
-    "@storybook/addon-a11y": "^6.4.14",
+    "@storybook/addon-a11y": "^6.4.17",
     "@storybook/addon-actions": "^6.4.14",
     "@storybook/addon-links": "^6.4.17",
     "@storybook/addon-storysource": "^6.4.14",