docs: remove support for previous action versions v4 and v5

[MikeMcC399]

This PR removes support for cypress-io/github-action@v4 and cypress-io/github-action@v5 since these versions rely on Node.js 16 which entered into End-of-Life status on Sep 11, 2023. Cypress no longer supports Node.js 16. Additionally, the GitHub blog post GitHub Actions; All Actions will run on Node20 instead of Node16 by default announces that all actions are forced to run under Node.js 20 starting on May 13, 2024, rendering the selection of lower versions of cypress-io/github-action ineffective.

cypress-io/github-action@v6 running under Node.js 20 is the currently recommended and supported version.

Background

Action version	Node.js version	Node.js status
v6	20	Long-Term-Support (LTS)
v5	16	End-of-life
v4	16	End-of-life
v3	16	End-of-life
v2	12	End-of-life
v1	12	End-of-life

References

• Node.js release schedule
• Cypress > System requirements
• GitHub Actions; All Actions will run on Node20 instead of Node16 by default Mar 7, 2024

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[MikeMcC399]

@jennifer-shehane

You approved this PR several days ago and it is now awaiting merge. Please carry on and merge or let me know if there are any changes need. Thanks!

[jennifer-shehane]

Thanks!

[github-actions]

🎉 This PR is included in version 6.7.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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