build(deps-dev): bump vitest from 2.1.5 to 2.1.9

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.5 to 2.1.9.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.9/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -159,7 +159,7 @@
     "typescript": "^5.6.3",
     "typescript-eslint": "^8.4.0",
     "vitepress": "1.6.3",
-    "vitest": "^2.1.5",
+    "vitest": "^2.1.9",
     "vue": "3.5.13",
     "vue-i18n": "workspace:*"
   },