fix: use downloadable go directive 1.22.0

[mattsse]

Motivation

Caused by:
process didn't exit successfully: /Users/Matthias/git/rust/sp1/target/debug/build/sp1-recursion-gnark-ffi-5c63451eec7e8a67/build-script-build (exit status: 101)
--- stdout
cargo:rerun-if-changed=go
Building Go library at /Users/Matthias/git/rust/sp1/target/debug/build/sp1-recursion-gnark-ffi-d2e6560ead9a758e/out/libsp1gnark.a

--- stderr
go: downloading go1.22 (darwin/arm64)
go: download go1.22 for darwin/arm64: toolchain not available

Solution

according to golang/go#65568 (comment)

go 1.22 without a more specific toolchain directive is not sufficient.

golang/go#62278 (comment)

this is as expected: go 1.21 was a development version of the language, for which there is no downloadable release (because it is not a specific version). The release version would be go 1.21.0.

see also: https://go.dev/doc/devel/release#go1.22.0

I assume the CI "go-version: "1.22"" is fine because the action handles this?

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes