fix: dockerfile: Bump to Go 1.20.7 image

[magik6k]

Related Issues

Should fix failing master build

Proposed Changes

Additional Info

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, market, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green

[magik6k]

Verified that it builds successfully

$ docker build --file=./Dockerfile --tag=docker.io/filecoin/lotus-all-in-one:master-butterflynet --target lotus-all-in-one --build-arg GOFLAGS=-tags=butterflynet .
 => [internal] load .dockerignore                                                                                 0.0s
 => => transferring context: 946B                                                                                 0.0s
 => [internal] load build definition from Dockerfile                                                              0.0s
 => => transferring dockerfile: 4.83kB                                                                            0.0s
 => [internal] load metadata for docker.io/library/ubuntu:20.04                                                   0.4s
 => [internal] load metadata for docker.io/library/golang:1.20.7-bullseye                                         0.4s
....
 => => exporting layers                                                                                           2.1s
 => => writing image sha256:d840a861c73594d0806827ad3f66d27afc0d3b0bbe5f6a71910916c5ef771a47                      0.0s
 => => naming to docker.io/filecoin/lotus-all-in-one:master-butterflynet                                          0.0s