Describe the bug

In the definition of a step in a workflow, if you create a parameter with the key "key", for example a POST in a WebHook:

steps:
- name: webhook
   provider:
     type: webhook
     config: "{{ config }}"
     with:
       url: https://test/test
       method: POST
       body:
         key: ALERT
         host: "{{alert.service}}"
         time: "{{alert.lastReceived}}"
         source: "{{alert.source}}"
         message: "{{alert.description}}"

The data of the POST body will be: "ALERT" and not a JSON with the keys: key, host, time, source and message.

This is because in parse_provider_parameters:

if the parameter is a dictionary it attempt to converted it to a StepProviderParameter and this works if the dict has a key with the name "key" because in the definition of de pydantic model "key" is the only required parameter