remove replace directive for gosigar dependency

[mintyleaf]

On arm64 MacOS machine i can't build the project with replaced mudler/[email protected]... package:

# github.com/elastic/gosigar
../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_common_darwin.go:473:6: sysctlbyname redeclared in this block
	../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_darwin.go:27:6: other declaration of sysctlbyname
../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_common_darwin.go:71:19: method Swap.Get already declared at ../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_darwin.go:57:19
../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_common_darwin.go:86:27: method HugeTLBPages.Get already declared at ../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_darwin.go:49:27
../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_common_darwin.go:91:18: method Cpu.Get already declared at ../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_darwin.go:65:18
../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_common_darwin.go:32:26: method LoadAverage.Get already declared at ../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_darwin.go:61:23
../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_common_darwin.go:45:18: method Mem.Get already declared at ../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_darwin.go:45:18
../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_common_darwin.go:167:22: method FDUsage.Get already declared at ../../../go/pkg/mod/github.com/mudler/[email protected]/sigar_darwin.go:53:22

removing replace directive and using upstream gosigar working flawlessly.

[mudler]

Nice! good to know that now gosigar builds against darwin!