Bump @storybook/vue from 6.3.6 to 7.4.0 in /webapp

Bumps [@storybook/vue](https://github.com/storybookjs/storybook/tree/HEAD/code/renderers/vue) from 6.3.6 to 7.4.0.
- [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/v7.4.0/code/renderers/vue)

---
updated-dependencies:
- dependency-name: "@storybook/vue"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

webapp/package.json

@@ -75,7 +75,7 @@
     "@storybook/addon-a11y": "^6.3.6",
     "@storybook/addon-actions": "^5.3.21",
     "@storybook/addon-notes": "^5.3.18",
-    "@storybook/vue": "~6.3.6",
+    "@storybook/vue": "~7.4.0",
     "@vue/cli-shared-utils": "~4.3.1",
     "@vue/eslint-config-prettier": "~6.0.0",
     "@vue/server-test-utils": "~1.0.0-beta.31",