[Feature request] Auto-update support for the portable version

Describe what this adds or solves

I prefer using the portable version of DLSS Swapper over the installer, but currently, it doesn't support auto-updates.

Currently, the only alternatives are manually updating the portable version from the GitHub releases page or switching to the installer version.

Describe the solution you'd like

I would love to see an auto-update feature developed for the portable build.

Additional context

No response