chore: lock vitest (#4488)

Author: Jason3S

package-lock.json

@@ -4222,7 +4222,7 @@
     "typescript": "~5.8.3",
     "typescript-eslint": "^8.33.0",
     "vite": "^6.3.5",
-    "vitest": "^3.1.4"
+    "vitest": "~3.1.4"
   },
   "dependencies": {
     "@cspell/cspell-bundled-dicts": "^9.0.2",