web: Bump storybook from 7.0.20 to 7.0.21 in /web (#5983)

Bumps [storybook](https://github.com/storybookjs/storybook/tree/HEAD/code/lib/cli) from 7.0.20 to 7.0.21.
- [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/v7.0.21/code/lib/cli)

---
updated-dependencies:
- dependency-name: storybook
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

web/package.json

@@ -102,7 +102,7 @@
         "rollup-plugin-postcss-lit": "^2.0.0",
         "rollup-plugin-terser": "^7.0.2",
         "sharp-cli": "^4.1.1",
-        "storybook": "^7.0.20",
+        "storybook": "^7.0.21",
         "ts-lit-plugin": "^1.2.1",
         "tslib": "^2.5.3",
         "turnstile-types": "^1.1.2",