Fix to expect correct response for workflow_dispatch

It looks like GitHub introduced a breaking change in the API response
for workflow_dispatch.

The API now returns `200 OK` with a response body, while both the
documentation[^1] and the SDK[^2] still expect the old `204 No Content`
response.

```ruby
  workflow_run_id: 20363538233,
  run_url: "https://api.github.com/repos/ubicloud/github-e2e-test-workflows/actions/runs/20363538233",
  html_url: "https://github.com/ubicloud/github-e2e-test-workflows/actions/runs/20363538233"}
>
```

https://github.com/orgs/community/discussions/182272

[^1]: https://docs.github.com/en/rest/actions/workflows?apiVersion=2022-11-28#create-a-workflow-dispatch-event--status-codes
[^2]: https://github.com/octokit/octokit.rb/blob/ea3413c3174571e87c83d358fc893cc7613091fa/lib/octokit/client/actions_workflows.rb#L41-L43

Author: enescakir

lib/octokit/client/actions_workflows.rb

@@ -36,10 +36,10 @@ def workflow(repo, id, options = {})
       # @param id [Integer, String] Id or file name of the workflow
       # @param ref [String] A SHA, branch name, or tag name
       #
-      # @return [Boolean] True if event was dispatched, false otherwise
+      # @return [<Sawyer::Resource>] Details of the dispatched workflow run
       # @see https://docs.github.com/en/rest/reference/actions#create-a-workflow-dispatch-event
       def workflow_dispatch(repo, id, ref, options = {})
-        boolean_from_response :post, "#{Repository.path repo}/actions/workflows/#{id}/dispatches", options.merge({ ref: ref })
+        post "#{Repository.path repo}/actions/workflows/#{id}/dispatches", options.merge({ ref: ref })
       end
 
       # Enable a workflow