chore(ci): update actions to Node 24

[gmegidish]

Summary

• upgrade actions/setup-go from v5 to v6
• upgrade actions/setup-java from v4 to v5
• upgrade artifact upload and download actions from v5 to v6
• remove Node.js 20 deprecation warnings across all build jobs

Verification

• parsed .github/workflows/build.yml as YAML
• confirmed no deprecated action versions remain
• make test

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📥 Commits

Reviewing files that changed from the base of the PR and between 45ab80b and 1afe08e.

📒 Files selected for processing (1)

• .github/workflows/build.yml

---

_{Comment @coderabbitai help to get the list of available commands.}