Latest racon build requires AVX-512

I am not sure if this was the intent, but build 7 in #58142 adds `-march=x86-64-v4` to the x86_64 build flags, causing racon to be built with AVX-512 instructions. AVX-512 is not exactly new, but only came to AMD with Zen 4 in late 2022, so this build of the package is not usable on many AMD CPUs currently in deployment. @mencian can you provide some context on why you went with x86-64-v4 for this build?