add build step for macOS Swift 6.3

[Aldo10012]

Summary by CodeRabbit

• Chores
  • Updated build pipeline to test against an additional Swift toolchain version for enhanced compatibility verification.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 284ddcf5-21c7-477e-afcc-c1f3974bd79a

📥 Commits

Reviewing files that changed from the base of the PR and between bc908e0 and 113956d.

📒 Files selected for processing (1)

• .github/workflows/build-test.yml

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📝 Walkthrough

Walkthrough

The macOS build workflow configuration was updated to include Swift toolchain version 6.3 in the build matrix, expanding test coverage from versions 5.10, 6.0, 6.1, and 6.2 to now include the latest version.

Changes

Cohort / File(s)	Summary
CI/CD Workflow Configuration .github/workflows/build-test.yml	Added Swift 6.3 to the macOS build job's toolchain version matrix for expanded test coverage.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Another Swift flies into our nest,
Version 6.3 joins all the rest,
Build matrix grows with rabbity glee,
More toolchains tested, more bugs we'll see! 🔧✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a Swift 6.3 build step to the macOS workflow configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch GHA_run_swift_6.3

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