[Bug Report] Forbidden(403) on Introduction to JumpStart - Sentence Pair Classification

**Link to the notebook**
[Add the link to the notebook.](https://github.com/aws/amazon-sagemaker-examples/blob/main/introduction_to_amazon_algorithms/jumpstart_sentence_pair_classification/Amazon_JumpStart_Sentence_Pair_Classification.ipynb)

**Describe the bug**
On session **2. Select a pre-trained model**, the s3 bucket returns "forbidden" for url s3://jumpstart-cache-prod-us-east-1/models_manifest.json
`ClientError: An error occurred (403) when calling the HeadObject operation: Forbidden`

The above exception occurs on a "optional" cell, but if not executed an **NameError: name 'dropdown' is not defined** is raised on **3.1. Retrieve JumpStart Artifacts & Deploy an Endpoint**

**To reproduce**
Just run the code on a regular user account.

**Logs**
```
---------------------------------------------------------------------------
ClientError Traceback (most recent call last)
Cell In[10], line 5
2 import ipywidgets as widgets
4 # download JumpStart model_manifest file.
----> 5 boto3.client("s3").download_file(
6 f"jumpstart-cache-prod-{aws_region}", "models_manifest.json", "models_manifest.json"
7 )
8 with open("models_manifest.json", "rb") as json_file:
9 model_list = json.load(json_file)

(...)

File ~/anaconda3/envs/python3/lib/python3.10/site-packages/botocore/client.py:1009, in BaseClient._make_api_call(self, operation_name, api_params)
1005 error_code = error_info.get("QueryErrorCode") or error_info.get(
1006 "Code"
1007 )
1008 error_class = self.exceptions.from_code(error_code)
-> 1009 raise error_class(parsed_response, operation_name)
1010 else:
1011 return parsed_response

ClientError: An error occurred (403) when calling the HeadObject operation: Forbidden
```