chore(deps): update vitest monorepo to v4.1.5

Upgrades vitest and @vitest/coverage-v8 from 4.1.4 to 4.1.5.

This is a patch release with only bug fixes and one experimental feature
(Istanbul instrumenter option). No migration is required.

All 5 tests pass with the new version.

Replaces the stale Renovate PR #53 which had merge conflicts due to being
created against an older state of main (vitest 1.x) and could not be merged.

Author: dtoxvanilla1991

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "@eslint/js": "^9.4.0",
     "@types/node": "^22.0.0",
-    "@vitest/coverage-v8": "^4.1.4",
+    "@vitest/coverage-v8": "^4.1.5",
     "eslint": "9.x",
     "eslint-plugin-jsdoc": "^50.0.0",
     "globals": "^15.4.0",
@@ -33,7 +33,7 @@
     "typescript-eslint": "^7.12.0",
     "vite": "^8.0.8",
     "vite-plugin-dts": "^4.5.4",
-    "vitest": "^4.1.4"
+    "vitest": "^4.1.5"
   },
   "packageManager": "pnpm@8.15.9+sha512.499434c9d8fdd1a2794ebf4552b3b25c0a633abcee5bb15e7b5de90f32f47b513aca98cd5cfd001c31f0db454bc3804edccd578501e4ca293a6816166bbd9f81"
 }