magic number in convert-gptq-to-ggml.py not consistent

[KASR]

It appears that the conver-gptq-to-ggml script needs an update to reflect the recent change in magic, see this line. However, it's not completely clear to me if only updating the magic number is sufficient to ensure that the resulting file is compatible. Hence leaving it here a reminder :)

[sw]

You're right, the *-to-ggml.py scripts haven't been updated -> #704.

I'm closing this as a duplicate even though you were first; I didn't see this before creating the other issue.