Updating actions to support Node.js 16

[Deakon997]

Reference to a related issue in the repository

193

Add a description

Fixed "deprecated node.js 12" warning.

Some questions to ask: What is this change? actions/checkout@v2 updated to actions/checkout@v3

What does it fix? Fixed "deprecated node.js 12" warning.

Is this a bug fix or a feature? Does it break any existing functionality or force me to update to a new version? Bugfix, all is intact, no update needed as action scripts only are fixed.

How has it been tested? Run action workflow OpenScenarioCpp successfully.

Mention a member

@Deakon997

Check the checklist

• [x] My code follows the contributors guidelines of this project.
• [x] I have performed a self-review of my own code.
• [ ] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [x] New and existing unit tests / travis ci pass locally with my changes.