upgrade to non-deprecated version of actions/cache

[melissag-ensemble]

Description

Upgrade to v3

Related Issue

v2 is deprecated and will cause errors on deploy (similar to what we've seen in https://github.com/AdobeDocsPrivate/video-reframe-api/actions/runs/13398958637/job/37428552732):

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.