ci: use local Go toolchain and downgrade Go version

[gustavosbarreto]

The GitHub Actions workflow defines:

strategy:
  matrix:
    go: ['1.23', '1.24']

However, the 1.23 job still ends up running Go 1.24. By default, actions/setup-go leaves GOTOOLCHAIN=auto, causing go itself to fetch the version specified in go.mod instead instead of sticking to exactly 1.23.

This led to a false positive in CI: it appeared as if the matrix was testing Go 1.23, when in reality all jobs were using Go 1.24.

To fix this, we need to force the use of the local Go toolchain in the CI test workflow to ensure the use of the locally installed Go version and avoid automatic downloads by setup-go.

Also downgrades the Go version in go.mod from 1.24 to 1.23 to ensure compatibility with environments that do not yet support Go 1.24.

Fixes #126

[pires]

Thanks a ton!

[coveralls]

coverage: 94.136%. remained the same
when pulling 4eac547 on gustavosbarreto:main
into 2293221 on pires:main.

[pires]

Somehow, the linter is asking for go mod tidy :( WDYT?

[gustavosbarreto]

I'll check this

[pires]

So it seems the sums for the deps change depending on the Go version being used, am I reading the go mod tidy correctly?

[gustavosbarreto]

So it seems the sums for the deps change depending on the Go version being used, am I reading the go mod tidy correctly?

Yep, even if go mod tidy doesn't change go.sum, it still refreshes the module state internally. That helps tools like golangci-lint, which rely on go list under the hood, avoid context loading errors in clean or containerized environments.