Houmgaor 0c6dc39371 ci: upgrade actions to Node.js 24-compatible versions ...

Node.js 20 actions are deprecated and will be forced to Node.js 24
starting June 2, 2026. Bump to versions that ship Node.js 24 runtimes:

  actions/checkout        v4 → v6
  actions/setup-go        v5 → v6
  golangci-lint-action    v7 → v9
  actions/upload-artifact v4 → v6
  actions/download-artifact v4 → v8

2026-03-23 10:36:31 +01:00

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ISSUE_TEMPLATE

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ci: upgrade actions to Node.js 24-compatible versions

2026-03-23 10:36:31 +01:00