Support for go 1.20

[7AC]

Prysm indirectly depends on quic-go:

https://github.com/prysmaticlabs/prysm/blob/develop/go.mod#L163

and the version in use is affected by quic-go/quic-go#3630

The issue is fixed in quic-go/quic-go#3641 but it requires upgrading github.com/libp2p/go-libp2p and github.com/libp2p/go-libp2p-pubsub (plus some adjustments).

[7AC]

This is also relevant prysmaticlabs/gohashtree#6

[prestonvanloon]

Thanks for filing this @7AC. We need to update to go 1.20 soon and there were a few blockers as you have pointed out. Were you able to make progress in polymerdao#22 and successfully compile with go 1.20?

[7AC]

@prestonvanloon the current status is I'm hitting prysmaticlabs/gohashtree#6 on macOS and the issue below on ubuntu (importing a few packages from prysm):

Error: ../../../go/pkg/mod/github.com/polymerdao/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:12:17: cannot convert PadTo(x, 4) (value of type []byte) to type [4]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
Error: ../../../go/pkg/mod/github.com/polymerdao/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:19:18: cannot convert PadTo(x, 20) (value of type []byte) to type [20]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
Error: ../../../go/pkg/mod/github.com/polymerdao/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:26:18: cannot convert PadTo(x, 32) (value of type []byte) to type [32]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
Error: ../../../go/pkg/mod/github.com/polymerdao/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:33:18: cannot convert PadTo(x, 48) (value of type []byte) to type [48]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
Error: ../../../go/pkg/mod/github.com/polymerdao/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:40:18: cannot convert PadTo(x, 64) (value of type []byte) to type [64]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)
Error: ../../../go/pkg/mod/github.com/polymerdao/prysm/[email protected]/encoding/bytesutil/bytes_go120.go:47:18: cannot convert PadTo(x, 96) (value of type []byte) to type [96]byte: conversion of slices to arrays requires go1.20 or later (-lang was set to go1.19; check go.mod)

Looks like it could be just a matter of changing the version in go.mod? I was reluctant to change it until prysmaticlabs/gohashtree#6 is fixed so we don't break compilation on macOS.

[potuz]

@prestonvanloon I need a timeline on when you need go 1.20 as gohashtree may take me a while to take a look due to other priorities.