Add assembly versions to About


### Discussed in https://github.com/ironmansoftware/psedit/discussions/85

<div type='discussions-op-text'>

<sup>Originally posted by **jdhitsolutions** November  6, 2025</sup>
Because other tools might use the Terminal.Gui assembly and there might be version conflicts, it would be helpful if the About window showed the version of the dependent assemblies.</div>