Add gopy version to generated header

I installed gopy and wasn't sure which version I have.
I was not sure what I use since release was not tagged in github -> latest was 0.4.8, but latest tag is 0.4.10.

Add support for:
gopy version

Generated files should/could include versison like mockey for example:
<img width="427" alt="image" src="https://github.com/user-attachments/assets/b78ec6c2-c9e7-452d-a924-89084e241e2f">
