build(deps-dev): bump @storybook/test-runner in /frontend

Bumps [@storybook/test-runner](https://github.com/storybookjs/test-runner) from 0.19.1 to 0.21.3.
- [Release notes](https://github.com/storybookjs/test-runner/releases)
- [Changelog](https://github.com/storybookjs/test-runner/blob/v0.21.3/CHANGELOG.md)
- [Commits](storybookjs/test-runner@v0.19.1...v0.21.3)

---
updated-dependencies:
- dependency-name: "@storybook/test-runner"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -91,7 +91,7 @@
     "@storybook/addon-links": "^8.4.4",
     "@storybook/blocks": "^8.3.6",
     "@storybook/test": "^8.4.2",
-    "@storybook/test-runner": "^0.19.1",
+    "@storybook/test-runner": "^0.21.3",
     "@storybook/vue3": "^8.3.6",
     "@storybook/vue3-vite": "^8.4.2",
     "@types/compression": "^1.7.5",