chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -41,7 +41,7 @@
 		"tinybench": "^5.0.0",
 		"tsconfck": "workspace:^",
 		"tsconfck-2": "npm:tsconfck@^2.1.2",
-		"vitest": "^3.2.4"
+		"vitest": "^4.0.0"
 	},
 	"lint-staged": {
 		"*.{js,md}": "eslint --cache --fix",

packages/tsconfck/package.json

@@ -50,12 +50,12 @@
 	"devDependencies": {
 		"@tsconfig/node18": "^18.2.4",
 		"@tsconfig/strictest": "^2.0.5",
-		"@vitest/coverage-v8": "^3.2.4",
+		"@vitest/coverage-v8": "^4.0.0",
 		"esbuild": "^0.25.9",
 		"isaacscript-tsconfig": "^7.0.1",
 		"tiny-glob": "^0.2.9",
 		"typescript": "^5.9.2",
-		"vitest": "^3.2.4"
+		"vitest": "^4.0.0"
 	},
 	"engines": {
 		"node": "^18 || >=20"