ci: bump actions to Node 24 compatible versions

[pcfreak30]

actions/checkout v4→v6, actions/setup-go v5→v6,
peter-evans/find-comment v3→v4

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Bump GitHub Actions to Node 24 compatible versions

Update the following actions in the Go CI workflow to their latest versions that support Node 24:

• actions/checkout from v4 to v6
• actions/setup-go from v5 to v6
• peter-evans/find-comment from v3 to v4

[kody-ai]

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[github-actions]

Code Coverage Report

Total Coverage: 53.5%

Generated from commit: 9d2bd64
Repository: LumeWeb/pinner-cli