chore(deps): update dependency @vitest/coverage-v8 to v4

Author: renovate[bot]

package.json

@@ -22,7 +22,7 @@
   },
   "devDependencies": {
     "@types/node": "^24.0.0",
-    "@vitest/coverage-v8": "3.2.4",
+    "@vitest/coverage-v8": "4.0.18",
     "dotenv": "^17.0.0",
     "typescript": "^5.8.3",
     "vitest": "^3.1.2"