chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -58,7 +58,7 @@
     "@types/mdast": "^4.0.4",
     "@types/node": "^24.8.1",
     "@typescript-eslint/parser": "^8.46.1",
-    "@vitest/coverage-v8": "3.2.4",
+    "@vitest/coverage-v8": "4.0.1",
     "astro-eslint-parser": "^1.2.2",
     "eslint": "^9.38.0",
     "eslint-config-prettier": "^10.1.8",
@@ -73,7 +73,7 @@
     "sirv": "^3.0.2",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.46.1",
-    "vitest": "3.2.4"
+    "vitest": "4.0.1"
   },
   "pnpm": {
     "overrides": {