chore(deps-dev): Bump the vitest group across 1 directory with 2 updates

Bumps the vitest group with 1 update in the / directory: [@vitest/coverage-istanbul](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-istanbul).


Updates `@vitest/coverage-istanbul` from 4.1.5 to 4.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.6/packages/coverage-istanbul)

Updates `vitest` from 4.1.5 to 4.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.6/packages/vitest)

---
updated-dependencies:
- dependency-name: "@vitest/coverage-istanbul"
  dependency-version: 4.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vitest
- dependency-name: vitest
  dependency-version: 4.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vitest
...

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

Author: dependabot[bot]

package-lock.json

@@ -72,7 +72,7 @@
     "@nextcloud/typings": "^1.10.0",
     "@nextcloud/vite-config": "^2.5.2",
     "@types/node": "^24.12.2",
-    "@vitest/coverage-istanbul": "^4.1.5",
+    "@vitest/coverage-istanbul": "^4.1.6",
     "fast-xml-parser": "^5.8.0",
     "jsdom": "^27.4.0",
     "tslib": "^2.8.1",