📎 Update dependency vitest to v2

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
     "eslint": "^9.13.0",
     "some-tsconfig-preset": "^1.5.0",
     "typescript": "^5.6.3",
-    "vitest": "^1.6.0"
+    "vitest": "^2.1.3"
   },
   "dependencies": {
     "@actions/core": "^1.11.1",