[Tooling] Bump actions/setup-go to 6.1.0

[tbavelier]

What does this PR do?

Bump actions/setup-go to 6.1.0 (latest)

Motivation

Same as Same as DataDog/helm-charts#2214, we need 6.1.0 to be able to fallback when downloads are not working anymore from GCP directly: actions/setup-go#665

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.55%. Comparing base (51611d1) to head (4435c38).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2369   +/-   ##
=======================================
  Coverage   36.55%   36.55%           
=======================================
  Files         281      281           
  Lines       23908    23908           
=======================================
  Hits         8740     8740           
  Misses      14484    14484           
  Partials      684      684           

Flag	Coverage Δ
unittests	36.55% <ø> (ø)

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