missing prebuilt Windows binaries

[nanamicat]

there are no prebuilt binaries since release https://github.com/ggerganov/llama.cpp/releases/tag/b2608

[phymbert]

Probably linked with:

• CI maintenance: Update checkout, setup-python and upload-artifact to latest versions #6456
• build CI: Name artifacts #6482

@EwoutH could you please have a look

[EwoutH]

Looks like something in the deploy step, will check