[ci] Configure action/setup-go to read golang version from go.mod #3825
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Why this should be merged
Previously a custom action was used to determine the golang version from go.mod. This is not necessary since setup-go can do this directly.
How this was tested
Checked that one of the jobs using setup-go downloaded 1.23.6 as intended:
https://github.com/ava-labs/avalanchego/actions/runs/14004060271/job/39215432386?pr=3825
Need to be documented in RELEASES.md?
N/A