Update the action/cache github action

[christophertubbs]

Our version of the cache for github actions is now out of date, so all automated tests will fail right out of the gate. We need to update to v3 or v4.

Details may be viewed in the logs for all recent action executions.

[aaraney]

For future link hunting, here is the upgrade guide notice linked in the failed action log: https://github.blog/changelog/2024-12-05-notice-of-upcoming-releases-and-breaking-changes-for-github-actions/#actions-cache-v1-v2-and-actions-toolkit-cache-package-closing-down