ci(deps): update CircleCI to xcode 16.4.0 / resource class m4pro.medium

[MikeMcC399]

• closes Migrate away from deprecated CircleCI resource class macos.m1.medium.gen1 #1006

Situation

CircleCI announced Deprecation of Mac M1 and M2 resource classes on Oct 15, 2025, with brownouts planned for Dec 2025 & Jan 2026 and removal on Feb 16, 2026.

The CircleCI config .circleci/config.yml uses xcode machine image 16.2.0, using macOS 14.6.1 with resource class macos.m1.medium.gen1.

Change

Update to latest xcode 16.x version 16.4.0 from Supported Xcode versions for Apple silicon using macOS 15.3.2.

Migrate away from the CircleCI macOS execution environment deprecated resource class using macos.m1.medium.gen1 to use instead the resource class m4pro.medium explicitly.

[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]

There is a warning in the mac-test job
https://app.circleci.com/pipelines/github/cypress-io/cypress-example-kitchensink/2211/workflows/4be25a4f-ddba-4412-8eca-067ce48d51cb/jobs/15267

/bin/sh: /Users/distiller/Library/Caches/Cypress/15.5.0/Cypress.app/Contents/Resources/app/node_modules/term-size/vendor/macos/term-size: Bad CPU type in executable

• This is not new and it requires resolution of Replace deprecated term-size cypress#30131 to stop this warning occurring.

[AtofStryker]

Thank you as always @MikeMcC399

[AtofStryker]

looks like we are running into the "npm not found" issue even though this passed on the pull branch 🤔 . Will take a look in a few since I'm doing some infra updates today