chore(deps): update test packages to v4

Author: renovate[bot]

package.json

@@ -37,7 +37,7 @@
     "@antfu/eslint-config": "6.0.0",
     "@codspeed/vitest-plugin": "5.0.1",
     "@types/node": "22.18.4",
-    "@vitest/coverage-v8": "3.2.4",
+    "@vitest/coverage-v8": "4.0.8",
     "bumpp": "10.2.3",
     "changelogithub": "13.16.0",
     "cheerio": "1.1.2",
@@ -48,7 +48,7 @@
     "lint-staged": "16.1.6",
     "simple-git-hooks": "2.13.1",
     "typescript": "5.9.2",
-    "vitest": "3.2.4"
+    "vitest": "4.0.8"
   },
   "resolutions": {
     "beasties": "workspace:*",