Description of Change

The following message was seen in a release build for 39-x-y:

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/cache@5a3ec84, actions/cache@5a3ec84, actions/checkout@11bd719. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

• ci: update actions/cache to 5.0.3 #50222 will update actions/cache. This PR just updates actions/checkout for 39-x-y.

Checklist

• PR description included
• npm test passes
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: none