build(deps-dev): bump eslint-plugin-testing-library in the eslint group

Bumps the eslint group with 1 update: [eslint-plugin-testing-library](https://github.com/testing-library/eslint-plugin-testing-library).


Updates `eslint-plugin-testing-library` from 7.6.1 to 7.6.3
- [Release notes](https://github.com/testing-library/eslint-plugin-testing-library/releases)
- [Changelog](https://github.com/testing-library/eslint-plugin-testing-library/blob/main/.releaserc.json)
- [Commits](testing-library/eslint-plugin-testing-library@v7.6.1...v7.6.3)

---
updated-dependencies:
- dependency-name: eslint-plugin-testing-library
  dependency-version: 7.6.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: eslint
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package.json

@@ -49,7 +49,7 @@
     "eslint": "^8.57.1",
     "eslint-config-next": "^15.4.4",
     "eslint-plugin-jest-dom": "^5.5.0",
-    "eslint-plugin-testing-library": "^7.6.1",
+    "eslint-plugin-testing-library": "^7.6.3",
     "husky": "^9.1.7",
     "jest": "^30.0.5",
     "jest-axe": "^10.0.0",