fix issue in validor dependency of react-express-mongodb sample (#174)

Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

react-express-mongodb/frontend/package.json

@@ -3,12 +3,12 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
-    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/jest-dom": "^5.15.0",
     "@testing-library/react": "^9.5.0",
     "@testing-library/user-event": "^7.2.1",
-    "axios": "^0.21.1",
+    "axios": "^0.21.4",
     "bootstrap": "^4.3.1",
-    "node-sass": "^5.0.0",
+    "node-sass": "^6.0.1",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-scripts": "^4.0.3"