Bump DuckDB on CI to 1.5.5

[suketa]

Summary

• Bump DuckDB version on CI from 1.5.4 to 1.5.5.
• Update the Ubuntu, macOS, and Windows test matrices.
• Update the expected SHA256 checksums (Ubuntu, macOS, and Windows) from the GitHub release digests.
• Add a CHANGELOG entry under Unreleased.

Release reference

• https://github.com/duckdb/duckdb/releases/tag/v1.5.5

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores

  • Updated CI testing across macOS, Ubuntu, and Windows to use DuckDB 1.5.5.
  • Updated download verification checks for the new DuckDB release.

• Documentation

  • Added the DuckDB 1.5.5 CI update to the unreleased changelog.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 4697b0f7-128d-4f1c-b224-b1b483363b42

📥 Commits

Reviewing files that changed from the base of the PR and between 07fe7cf and 92ae3c6.

📒 Files selected for processing (4)

• .github/workflows/test_on_macos.yml
• .github/workflows/test_on_ubuntu.yml
• .github/workflows/test_on_windows.yml
• CHANGELOG.md

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📝 Walkthrough

Walkthrough

DuckDB CI matrices for macOS, Ubuntu, and Windows now use version 1.5.5 with matching artifact checksums. The Unreleased changelog records the CI version bump.

Changes

DuckDB CI update

Layer / File(s)	Summary
Update CI versions and checksums .github/workflows/test_on_*.yml, CHANGELOG.md	The three platform workflows replace DuckDB 1.5.4 with 1.5.5 and update SHA256 verification values; the Unreleased changelog records the change.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• suketa/ruby-duckdb#1303: Updates the same CI workflows and DuckDB artifact checksums.
• suketa/ruby-duckdb#1359: Applies the same cross-platform DuckDB matrix and checksum update pattern.
• suketa/ruby-duckdb#1378: Modifies the same workflow matrices and expected SHA256 checksums.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: bumping DuckDB in CI from 1.5.4 to 1.5.5.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/update-duckdb-1.5.5

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