Correct cache eviction policy

[me-and]

Caches are evicted based on access time, not creation time.

Why:

Closes: #38743

What's being changed (if available, include any code snippets, screenshots, or gifs):

I noted an inconsistency with GitHub Actions Cache messaging with GitHub Support in ticket 3452653, where Arthur confirmed that this documentation is wrong.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

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Source	Review	Production	What Changed
actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	from reusable

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

Thanks for opening a PR! I'm going to double check with Support that this is accurate, and then hopefully we'll be able to get it rolling.