Update documentation references to actions/cache to v6 (#20332)
This PR contains the following updates:
| Package | Update | Change |
|---|---|---|
| [actions/cache](https://redirect.github.com/actions/cache) | major |
`v5` → `v6` |
---
### Release Notes
<details>
<summary>actions/cache (actions/cache)</summary>
###
[`v6`](https://redirect.github.com/actions/cache/compare/v5.0.5...v6.0.0)
[Compare
Source](https://redirect.github.com/actions/cache/compare/v5...v6)
</details>
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