using declarations not recognized by NUnit2045

Repro:
[NUnitTest.zip](https://github.com/user-attachments/files/21774129/NUnitTest.zip)

<img width="991" height="537" alt="Image" src="https://github.com/user-attachments/assets/e9e2f92b-09ff-472a-8ddc-7cfa8f9e470d" />

Works when this is a classic using statement