Feat(medusa-test-utils, utils, pricing, product, link-modules): upgrade mikro orm version to latest (#5985)

* update mikro-orm version

* add changeset

* update product tests

* add optional number serializer util

* upgrade cart mikro-orm versions

* clean up test

packages/medusa-test-utils/package.json

@@ -30,8 +30,8 @@
     "typescript": "^5.1.6"
   },
   "dependencies": {
-    "@mikro-orm/migrations": "5.7.12",
-    "@mikro-orm/postgresql": "5.7.12",
+    "@mikro-orm/migrations": "5.9.7",
+    "@mikro-orm/postgresql": "5.9.7",
     "medusa-core-utils": "^1.2.0",
     "pg-god": "^1.0.12",
     "randomatic": "^3.1.1"