Update tests.yml

[ozennou]

• Add node 22
• Update actions/setup-node from v3 to v4
• Ignore .md files from triggering the workflow

Description

• The addition of Node version 22 to ensures that your project is compatible with the latest stable release of Node.
  https://github.com/nodejs/node/releases/tag/v22.13.0
• The update from actions/setup-node@v3 to actions/setup-node@v4 brings several improvements, including better stability, faster execution, and enhanced support for newer Node versions.
• Prevents the workflow from being triggered by modifications to .md files. This helps to reduce unnecessary builds or tests when documentation files are updated, ensuring that only relevant code changes trigger the workflow.

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Checklist

• Does npm test pass with this change (including linting)?
• Is the new or changed code fully tested?

[bobymicroby]

Thank you for your contribution!