FURB171 Does not trigger when calling set(...)

### Description

Minimal code snippet:

```python
if 1 in {1}:  # This triggers
    print("Single-element set")

if 1 in set([1]):  # This does not, but is equivalent
    print("Single-element set")
```

Command:
`ruff check --isolated testfile.py --select FURB171 --preview`


No other settings. 

Ruff version 0.9.3.