The ssg.yaml.open_and_expand function does not recognize {"x": true} as a boolean value

#### Share the context

Follow-up on https://github.com/ComplianceAsCode/content/pull/9700#discussion_r1004348387.

#### Description of problem:

Because of `ssg.yaml.open_and_expand` function behavior we sometimes have to resort to ugly functions in [our code](https://github.com/ComplianceAsCode/content/blob/40b629d90d5642d9c1d1ef135e88cb2025c1a8cf/ssg/build_cpe.py#L177).

The behavior comes across as sub-optimal. It there a reason for it and could it be improved?

#### Proposed change:

The `yaml.load` function does the right thing. Can we change `ssg.yaml.open_and_expand` to act in the same manner?