fix: src/backend/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-EXPRESS-6474509

src/backend/package.json

@@ -33,7 +33,7 @@
     "@nestjs/class-validator": "0.13.4",
     "@nestjs/common": "10.2.10",
     "@nestjs/core": "10.2.10",
-    "@nestjs/platform-express": "10.2.10",
+    "@nestjs/platform-express": "10.3.6",
     "@nestjs/swagger": "7.1.16",
     "@nestjs/typeorm": "10.0.1",
     "class-transformer": "0.5.1",