Support golang v1.20.x

[jacobheun]

Go recently release version 1.20. We have reports from users that Boost does not compile on the latest version.

With this we should update our minimum version to match golangs version support policy (which would be 1.19 and 1.20)

relates to filecoin-project/lotus#10199

[jacobheun]

There is likely to be a dependency update trickle required to get this to land (such as propagating QUIC updates from libp2p up the stack), so this will likely take multiple days and coordination to get fully integrated.

[marten-seemann]

As this repo depends on lotus, filecoin-project/lotus#10199 needs to be resolved first.

[LexLuthr]

https://boost.filecoin.io/getting-started#boost-and-lotus-compatibility-matrix closing as complete.