Bump golang version to 1.23.2

[j0sh]

What does this pull request do? Explain your changes. (required)

Bump golang version to 1.23.2 from 1.21.4

This is needed for #3211 - technically only 1.22 is required but golang is already on 1.23 and releases are very stable so we might as well ... go ... straight to the latest version.

Specific updates (required)

• Updates go.mod
• Updates CI downloads

Technically we do not need to update the CI-installed version of golang because apparently go mod will download updated toolchains on its own (!) since version 1.21 but it seems better to stay somewhat consistent. This behavior also eases the migration path for fellow developers: if you could already compile go-livepeer before this, you can still compile go-livepeer after - this without doing anything - since your golang will automatically update itself (!)

How did you test each of these updates (required)

Everything compiles and tests pass

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[leszko]

@j0sh The PR looks fine, but please check if CI is passing. I just enabled CI with tests and lint, so let's try to keep it green.

Sorry if it broke your build, but I'm trying to put ai-video into good shape (and then merge it into master). Thanks for the understanding.

[j0sh]

@leszko Seems that CI passed (see image below), unless you are referring to something else?