Bump @testing-library/jest-dom from 6.8.0 to 6.9.1 in the testing group

Bumps the testing group with 1 update: [@testing-library/jest-dom](https://github.com/testing-library/jest-dom).


Updates `@testing-library/jest-dom` from 6.8.0 to 6.9.1
- [Release notes](https://github.com/testing-library/jest-dom/releases)
- [Changelog](https://github.com/testing-library/jest-dom/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testing-library/jest-dom/compare/v6.8.0...v6.9.1)

---
updated-dependencies:
- dependency-name: "@testing-library/jest-dom"
  dependency-version: 6.9.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: testing
...

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

package.json

@@ -53,7 +53,7 @@
     "@shlinkio/eslint-config-js-coding-standard": "~3.5.0",
     "@stylistic/eslint-plugin": "^5.4.0",
     "@tailwindcss/vite": "^4.1.14",
-    "@testing-library/jest-dom": "^6.8.0",
+    "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
     "@total-typescript/shoehorn": "^0.1.2",