Bump eslint-plugin-testing-library (#20731)

Bumps [eslint-plugin-testing-library](https://github.com/testing-library/eslint-plugin-testing-library) from 6.3.0 to 6.3.4.
- [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@v6.3.0...v6.3.4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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

@@ -29,6 +29,6 @@
     "eslint-plugin-jsx-a11y": "6.10.0",
     "eslint-plugin-react": "7.37.1",
     "eslint-plugin-react-hooks": "4.6.2",
-    "eslint-plugin-testing-library": "6.3.0"
+    "eslint-plugin-testing-library": "6.3.4"
   }
 }