Co-authored-by: khanhkhanhlele <[email protected]>

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

I'm working on upgrading a lot of packages to node 24 and there are many failures in native modules. Looking at logs alone it's hard to spot which package versions are failing to build. node-gyp prints debug info about node, npm, and node-gyp but not the package that is currently being built.

It doesn't look like node-gyp reads package.json so I opted to read npm_package_ env vars, which is similar to the npm_config_ env vars node-gyp already reads.

Remove misleading warnings.
% `npm config list -l | grep msvs`
% `npm config set msvs_version=2025`
> npm error `msvs_version` is not a valid npm option

`os.availableParallelism()` should produce more accurate results of how
much parallelism should be used then `os.cpus().length`. The only
breaking change is the newer API requires node versions >= v18.x which
is fine as node-gyp only aims to support latest and LTS releases. And
the oldest LTS release still supported as of this commit is v22.

Fixes #3191

Remove misleading warnings.
% `npm config list -l | grep python ` # no hits
% `npm config set python=3.14`
> npm error `python` is not a valid npm option

<!--
Thank you for your pull request. Please review the below requirements.

Contributor guide: https://github.com/nodejs/node/blob/main/CONTRIBUTING.md
-->

##### Checklist
<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->

- [ ] `npm install && npm run lint && npm test` passes
- [ ] tests are included <!-- Bug fixes and new features should include tests -->
- [ ] documentation is changed or added
- [x] commit message follows [commit guidelines](https://github.com/googleapis/release-please#how-should-i-write-my-commits)

##### Description of change
<!-- Provide a description of the change -->

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: cclauss <[email protected]>