fix: bump contentful-sdk-core to ensure httpsAgent isn't copied [EXT-5676] (#2378)

Author: jjolton-contentful

package-lock.json

@@ -89,7 +89,7 @@
     "@contentful/rich-text-types": "^16.6.1",
     "axios": "^1.7.4",
     "contentful-resolve-response": "^1.9.0",
-    "contentful-sdk-core": "^8.3.1",
+    "contentful-sdk-core": "^9.0.1",
     "json-stringify-safe": "^5.0.1",
     "type-fest": "^4.0.0"
   },