object literal expression parsed in way that can't be serialized

[tmccombs]

Describe the bug

In contexts where a map or object is part of an hcl expression, the load or loads function will deserialize as an invalid interpolation.

Software:

• OS: linux
• Python version: 3.13 6
• python-hcl2 version: 7.3.1

Snippet of HCL2 code causing the unexpected behaviour:

locals {
  foo = var.a ? { id = 1 } : null
}

Expected behavior

I expect to get back a valid hcl expression for local.foo, something like

"${var.a ? {id = 1} : null}"

** Actual behavior**
 but instead hcl2.load gives me:

```python
"${var.a ? {'id': 1} : null}"

Notice how the object is setialized like a python dict, not an hcl object.

Then if I try to use reverse_tranaform on it, I get an exception about an unexpected token for the "'".