bump ruby 4.0.3 on Ubuntu, MacOS

[suketa]

Summary by CodeRabbit

• Chores
  • Updated Ruby version to 4.0.3 in CI test workflows.

[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: 67d77ce0-126d-49e3-98b7-9909a45ef1c1

📥 Commits

Reviewing files that changed from the base of the PR and between b868850 and 3043c16.

📒 Files selected for processing (2)

• .github/workflows/test_on_macos.yml
• .github/workflows/test_on_ubuntu.yml

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📝 Walkthrough

Walkthrough

Two GitHub Actions CI workflow files are updated to bump the tested Ruby version from 4.0.2 to 4.0.3 in their test matrices for both macOS and Ubuntu environments.

Changes

Cohort / File(s)	Summary
CI Workflow Ruby Version Bump .github/workflows/test_on_macos.yml, .github/workflows/test_on_ubuntu.yml	Ruby patch version updated from 4.0.2 to 4.0.3 in the test matrix strategy for both macOS and Ubuntu CI workflows.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• bump Ruby 4.0.1 => 4.0.2 #1156: Directly related—modifies the same workflow files to bump the Ruby 4.0.x matrix entry (4.0.1→4.0.2 in prior version).
• use Ruby 3.4.9 in CI. #1145: Updates the same GitHub Actions workflow files with Ruby matrix version changes.
• bump ruby on CI. #928: Changes the same workflow files by bumping Ruby patch versions in the CI test matrix.

Poem

🐰 A rabbit hops through Ruby's lands,
From 4.0.2 to 4.0.3 it stands,
Two workflows patched with gentle care,
Version bumps floating in the air! 🎉

🚥 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 and specifically describes the main change: updating Ruby from 4.0.2 to 4.0.3 in CI workflows for both Ubuntu and macOS platforms.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump_ruby_4.0.3

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