fix: upgrade @testing-library/jest-dom from 6.6.3 to 6.6.4 (#317)

Snyk has created this PR to upgrade @testing-library/jest-dom from 6.6.3 to 6.6.4.

See this package in npm:
@testing-library/jest-dom

See this project in Snyk:
https://app.snyk.io/org/nodeshift-agg/project/63543855-c8af-438d-9aa9-ce9af390b39e?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: lholmquist

frontend/package-lock.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "private": true,
   "dependencies": {
-    "@testing-library/jest-dom": "^6.6.2",
+    "@testing-library/jest-dom": "^6.6.4",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
     "react": "^19.0.0",