Update nodemon to fix dependency security issue in dot-prop

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

react-express-mysql/backend/package.json

@@ -24,6 +24,6 @@
     "chai-http": "^4.3.0",
     "cross-env": "^7.0.2",
     "mocha": "^7.1.1",
-    "nodemon": "^2.0.2"
+    "nodemon": "^2.0.4"
   }
 }