chore(deps-dev): bump vitest and @vitest/coverage-istanbul

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) and [@vitest/coverage-istanbul](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-istanbul). These dependencies needed to be updated together.

Updates `vitest` from 1.5.3 to 1.6.0
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v1.6.0/packages/vitest)

Updates `@vitest/coverage-istanbul` from 1.5.3 to 1.6.0
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v1.6.0/packages/coverage-istanbul)

---
updated-dependencies:
- dependency-name: vitest
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: "@vitest/coverage-istanbul"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -41,7 +41,7 @@
   "devDependencies": {
     "@eslint/js": "^8.57.0",
     "@tsconfig/node20": "^20.1.4",
-    "@vitest/coverage-istanbul": "^1.5.3",
+    "@vitest/coverage-istanbul": "^1.6.0",
     "env-cmd": "^10.1.0",
     "eslint": "^8.57.0",
     "eslint-plugin-n": "^17.4.0",
@@ -50,7 +50,7 @@
     "shx": "^0.3.4",
     "typescript": "^5.4.5",
     "typescript-eslint": "^7.8.0",
-    "vitest": "^1.5.3"
+    "vitest": "^1.6.0"
   },
   "engines": {
     "node": ">=20"