Bump @testing-library/jest-dom from 6.3.0 to 6.4.0

Bumps [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/testing-library/jest-dom/releases)
- [Changelog](https://github.com/testing-library/jest-dom/blob/main/CHANGELOG.md)
- [Commits](testing-library/jest-dom@v6.3.0...v6.4.0)

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

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

package.json

@@ -32,7 +32,7 @@
   "author": "GOV.UK PaaS Team",
   "license": "MIT",
   "devDependencies": {
-    "@testing-library/jest-dom": "^6.3.0",
+    "@testing-library/jest-dom": "^6.4.0",
     "@testing-library/react": "^14.1.2",
     "@types/aws-sdk": "^2.7.0",
     "@types/body-parser": "^1.19.5",