Bump @testing-library/jest-dom from 4.2.4 to 5.16.2 in /theme (#346)

Bumps [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) from 4.2.4 to 5.16.2.
- [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@v4.2.4...v5.16.2)

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

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

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

Author: dependabot[bot]

theme/package.json

@@ -36,7 +36,7 @@
     "@primer/react": "^34.5.0",
     "@primer/octicons-react": "^16.3.1",
     "@styled-system/theme-get": "^5.0.12",
-    "@testing-library/jest-dom": "^4.1.0",
+    "@testing-library/jest-dom": "^5.16.2",
     "@testing-library/react": "^9.1.3",
     "axios": "^0.21.2",
     "babel-jest": "^24.9.0",