Update workflow pins and migrate Node matrices to modern versions

[HarithaVattikuti]

Description:
Update workflow pins and migrate Node matrices to modern versions:

• pin actions/checkout to (v7.0.0)
• pin pnpm/action-setup to (v6.0.9)
• remove EOL versions
• replace macos-latest-large with macos-15-intel in workflow matrices

Related issue:
Add link to the related issue.

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

Updates CI workflows and documentation to reflect newer, more secure defaults: workflows move to immutable action pins, drop older Node/EOL coverage, and adjust OS matrices (including macOS Intel targeting), while docs/examples are updated to reference actions/setup-node@v7.

Changes:

• Pinned GitHub Actions used in workflows to specific commit SHAs (e.g., actions/checkout, actions/publish-immutable-action, pnpm/action-setup).
• Modernized workflow matrices: removed older Node versions, added newer Node majors, and replaced macos-latest-large with macos-15-intel.
• Updated README/docs examples from actions/setup-node@v6 to actions/setup-node@v7.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
README.md	Updates usage examples to actions/setup-node@v7.
docs/advanced-usage.md	Updates advanced examples to actions/setup-node@v7 and adjusts example matrices.
.github/workflows/versions.yml	Pins actions/checkout and modernizes OS/Node/LTS test matrices.
.github/workflows/publish-immutable-actions.yml	Pins checkout and publish action to immutable SHAs.
.github/workflows/proxy.yml	Pins checkout to an immutable SHA.
.github/workflows/e2e-cache.yml	Pins checkout and pnpm setup actions; updates Node/OS matrices.
tests/data/package-dev-engines.json	Updates devEngines test data to a newer Node major.

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