web: Bump @storybook/addon-essentials from 7.0.20 to 7.0.21 in /web (#5981)

Bumps [@storybook/addon-essentials](https://github.com/storybookjs/storybook/tree/HEAD/code/addons/essentials) 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/addons/essentials)

---
updated-dependencies:
- dependency-name: "@storybook/addon-essentials"
  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

@@ -71,7 +71,7 @@
         "@rollup/plugin-node-resolve": "^15.0.2",
         "@rollup/plugin-replace": "^5.0.2",
         "@rollup/plugin-typescript": "^11.1.1",
-        "@storybook/addon-essentials": "^7.0.20",
+        "@storybook/addon-essentials": "^7.0.21",
         "@storybook/addon-links": "^7.0.21",
         "@storybook/blocks": "^7.0.21",
         "@storybook/web-components": "^7.0.21",