chore: Fix CI pipeline (#1839)

packages/medusa/package.json

@@ -31,11 +31,10 @@
     "prettier": "^1.19.1",
     "sqlite3": "^5.0.2",
     "supertest": "^4.0.2",
-    "ts-jest": "^28.0.1",
+    "ts-jest": "^25.5.1",
     "typescript": "^4.4.4"
   },
   "scripts": {
-    "start": "nodemon --watch plugins/ --watch src/ --exec babel-node src/app.js",
     "watch": "tsc --build --watch",
     "prepare": "cross-env NODE_ENV=production yarn run build",
     "build": "tsc --build",