fix: packages/dev-utils/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANSIREGEX-1583908
- https://snyk.io/vuln/SNYK-JS-DECODEURICOMPONENT-3149970
- https://snyk.io/vuln/SNYK-JS-LOADERUTILS-3043105

packages/dev-utils/package.json

@@ -39,13 +39,13 @@
     "@backstage/theme": "^0.2.9",
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
-    "@testing-library/jest-dom": "^5.10.1",
-    "@testing-library/react": "^11.2.5",
+    "@testing-library/jest-dom": "^6.0.0",
+    "@testing-library/react": "^16.0.0",
     "@testing-library/user-event": "^13.1.8",
     "@types/react": "*",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
-    "react-hot-loader": "^4.12.21",
+    "react-hot-loader": "^4.13.1",
     "react-router": "6.0.0-beta.0",
     "react-router-dom": "6.0.0-beta.0"
   },