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 2.1.4 to 2.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.6/packages/vitest)

Updates `@vitest/coverage-istanbul` from 2.1.4 to 2.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.6/packages/coverage-istanbul)

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

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

Author: dependabot[bot]

package.json

@@ -34,7 +34,7 @@
     "@tsconfig/node18": "^18.2.4",
     "@typescript-eslint/eslint-plugin": "^7.18.0",
     "@typescript-eslint/parser": "^7.18.0",
-    "@vitest/coverage-istanbul": "^2.1.4",
+    "@vitest/coverage-istanbul": "^2.1.6",
     "cspell": "^8.16.0",
     "eslint": "^8.57.1",
     "eslint-config-prettier": "^9.1.0",
@@ -46,7 +46,7 @@
     "eslint-plugin-simple-import-sort": "^12.1.1",
     "inject-markdown": "^3.1.4",
     "typescript": "^5.6.3",
-    "vitest": "^2.1.4"
+    "vitest": "^2.1.6"
   },
   "files": [
     "dist/**/*.js",