feat: update README and GH actions

[AndrewHanasiro]

Summary by CodeRabbit

• Chores

  • Updated CI/CD GitHub Actions to newer versions for enhanced security and compatibility.

• Documentation

  • Added Known Vulnerabilities security badge to project documentation.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

GitHub Actions used in multiple CI workflows are upgraded from v4 to v6 for checkout and setup-node actions, ensuring consistency across continuous_integration, test_load, and test_mutation workflows. Additionally, a Snyk Known Vulnerabilities badge is added to the README.

Changes

Cohort / File(s)	Summary
GitHub Actions version upgrades \.github/workflows/continuous_integration\.yml, \.github/workflows/test_load\.yml, \.github/workflows/test_mutation\.yml	Updated actions/checkout from v4 to v6 and actions/setup-node from v4 to v6 across all CI jobs. No logic or step ordering changes; only action version bumps.
Documentation badge addition README\.md	Added Known Vulnerabilities badge linking to Snyk after the existing Codacy badge.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• These are routine dependency/action version updates with no logic changes across all workflow files
• Badge addition is a straightforward documentation change

Poem

🐰 With actions fresh and versions bright,
We hop to v6, workflows take flight!
Snyk's badge now guards our code with care,
A fluffy update, beyond compare! ✨

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/update-readme-GH-actions

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📜 Recent review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between f3712bd and d66472d.

📒 Files selected for processing (4)

• .github/workflows/continuous_integration.yml (4 hunks)
• .github/workflows/test_load.yml (2 hunks)
• .github/workflows/test_mutation.yml (1 hunks)
• README.md (1 hunks)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud