testing/gost: update go.{mod/sum} to support loongarch64

loongarch64 build encountered the error:

# github.com/templexxx/cpu
../go-mod/github.com/templexxx/cpu@v0.1.0/cpu.go:93:14: undefined array length CacheLineSize or missing type constraint
../go-mod/github.com/templexxx/cpu@v0.1.0/cpu.go:105:14: undefined array length CacheLineSize or missing type constraint
>>> ERROR: gost: build failed
>>> gost: Uninstalling dependencies...

The latest tag of the dependency library github.com/templexxx/cpu has already added support for this architecture.And the upstream MR has not been merged yet.