deps(npm): bump @stryker-mutator/vitest-runner in /frontend/taskdeck-web

Bumps [@stryker-mutator/vitest-runner](https://github.com/stryker-mutator/stryker-js/tree/HEAD/packages/vitest-runner) from 8.7.1 to 9.6.1.
- [Release notes](https://github.com/stryker-mutator/stryker-js/releases)
- [Changelog](https://github.com/stryker-mutator/stryker-js/blob/master/packages/vitest-runner/CHANGELOG.md)
- [Commits](https://github.com/stryker-mutator/stryker-js/commits/v9.6.1/packages/vitest-runner)

---
updated-dependencies:
- dependency-name: "@stryker-mutator/vitest-runner"
  dependency-version: 9.6.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

frontend/taskdeck-web/package-lock.json

@@ -56,7 +56,7 @@
     "@playwright/test": "^1.59.1",
     "@storybook/vue3-vite": "^10.3.5",
     "@stryker-mutator/core": "^8.7.1",
-    "@stryker-mutator/vitest-runner": "^8.7.1",
+    "@stryker-mutator/vitest-runner": "^9.6.1",
     "@tailwindcss/postcss": "^4.2.2",
     "@types/dompurify": "^3.2.0",
     "@types/node": "^25.6.0",