GitHub Action Checkout step version upgraded to v4

[chamodshehanka]

Which problem is this PR solving?

Node.js 16 actions are deprecated therefore I upgraded github action action checkout step to latest version of v4 Closes: https://github.com/jaegertracing/documentation/issues/715

Description of the changes

• Node.js 16 actions are deprecated. with this upgrade, deprecated warning will go away

How was this change tested?

• Tested on GitHub Action run

Checklist

• [ ] I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• [ ] I have signed all commits
• [ ] I have added unit tests for the new functionality
• [ ] I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

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[jkowall]

@chamodshehanka thanks for the PR, you need to sign the DCO, as you can see the PR doesn't pass. If you need help just message on the CNCF Slack #jaeger channel

[yurishkuro]

done by dependabot #724