Bump eslint-plugin-testing-library

Bumps [eslint-plugin-testing-library](https://github.com/testing-library/eslint-plugin-testing-library) from 7.13.6 to 7.15.3.
- [Release notes](https://github.com/testing-library/eslint-plugin-testing-library/releases)
- [Changelog](https://github.com/testing-library/eslint-plugin-testing-library/blob/main/release.config.js)
- [Commits](testing-library/eslint-plugin-testing-library@v7.13.6...v7.15.3)

---
updated-dependencies:
- dependency-name: eslint-plugin-testing-library
  dependency-version: 7.15.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

graylog2-web-interface/packages/eslint-config-graylog/package.json

@@ -29,7 +29,7 @@
     "eslint-plugin-jsx-a11y": "6.10.2",
     "eslint-plugin-react": "7.37.5",
     "eslint-plugin-react-hooks": "7.0.1",
-    "eslint-plugin-testing-library": "7.13.6",
+    "eslint-plugin-testing-library": "7.15.3",
     "typescript-eslint": "^8.44.1"
   }
 }