fix: upgrade @testing-library/jest-dom from 6.4.5 to 6.4.6

Snyk has created this PR to upgrade @testing-library/jest-dom from 6.4.5 to 6.4.6.

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

See this project in Snyk:
https://app.snyk.io/org/chrlyons/project/c5da313c-0f99-4144-81fa-434fb80233d2?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

frontend/package-lock.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
-    "@testing-library/jest-dom": "^6.4.2",
+    "@testing-library/jest-dom": "^6.4.6",
     "@testing-library/react": "^15.0.6",
     "@testing-library/user-event": "^14.5.2",
     "axios": "^1.6.8",