test(deps): update actions/cache to v5

[MikeMcC399]

• closes Update actions/cache to node24 version #1571

Situation

Documentation and examples currently use the GitHub JavaScript actions/cache@v4 which runs.using node20, and which is deprecated with a schedule to be bypassed in March 2026 (see Deprecation of Node 20 on GitHub Actions runners).

actions/cache@v5.0.0 was released on Dec 11, 2025 and this is set up for runs.using node24.

Change

In the README > Install Cypress only section, and the corresponding example-install-only.yml workflow, update:

From	To
actions/cache@v4	actions/cache@v5

Verify

1. Run example-install-only.yml - Note

   Cache not found for input keys: my-cache-Linux-<hash>

2. Re-run - Note

   Cache restored successfully
   Cache restored from key: my-cache-Linux-<hash>

[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.

[github-actions]

🎉 This PR is included in version 6.10.7 🎉

The release is available on:

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

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