Go 1.21 Support

[dstrelau]

Hello! I just tried to build our project using this with Go 1.21 and it looks like there might be some updates needed:

# github.com/pyroscope-io/godeltaprof/internal/pprof
../../../../pkg/mod/github.com/pyroscope-io/godeltaprof@v0.1.1/internal/pprof/delta_mutex.go:25:20: undefined: runtime_cyclesPerSecond
../../../../pkg/mod/github.com/pyroscope-io/godeltaprof@v0.1.1/internal/pprof/proto.go:400:8: undefined: runtime_expandFinalInlineFrame

I don't have any idea what any of this means, but happy to provide more info or help where I can. Thank you!

[korniltsev]

Fixed in #5