Use robot.utils.DotDict instead of dict

robot.utils.DotDict supports dot-notation in order to access values in dictionaries: `${process.id}` instead of only `${process}[id]`

```python
from robot.utils import DotDict

@keyword("Get fetch response", tags=['task'])
def get_fetch_response(self):
"""Returns cached response from the last call of `fetch workload`.

The response contains all kind of data that is required for custom REST Calls.

Example:
| *** Settings *** |
| *Library* | RequestsLibrary |
| |
| *** Tasks *** |
| | *Create Session* | _alias=camunda_ | _url=http://localhost:8080/_ |
| | ${variables} | *fetch workload* | _my_first_task_in_demo_ | |
| | ${fetch_response} | *get fetch response* | | |
| | *POST On Session* | _camunda_ | _engine-rest/external-task/${fetch_response}[id]/complete_ | _json=${{ {'workerId': '${fetch_response}[worker_id]'} }}_ |
"""
if self.FETCH_RESPONSE:
return DotDict(self.FETCH_RESPONSE.to_dict())
return self.FETCH_RESPONSE
```

Start at the get_fetch_response entry point shown in the issue and inspect how FETCH_RESPONSE is converted before being returned. Verify that the returned value supports dot notation such as `${fetch_response.id}` as well as the existing dictionary access, then check the related issue or pull request history for the expected behavior.

Written by the indexing model from the issue text.