chore(deps): update actions/cache action to v6 (#498)

This PR contains the following updates:

| Package | Type | Update | Change | Pending |
|---|---|---|---|---|
| [actions/cache](https://redirect.github.com/actions/cache) | action |
major | `v5.0.5` → `v6.0.0` | `v6.1.0` |

---

### Release Notes

<details>
<summary>actions/cache (actions/cache)</summary>

###
[`v6.0.0`](https://redirect.github.com/actions/cache/releases/tag/v6.0.0)

[Compare
Source](https://redirect.github.com/actions/cache/compare/v5.1.0...v6.0.0)

#### What's Changed

- Update packages, migrate to ESM by
[@&#8203;Samirat](https://redirect.github.com/Samirat) in
[#&#8203;1760](https://redirect.github.com/actions/cache/pull/1760)

**Full Changelog**:
<actions/cache@v5...v6.0.0>

###
[`v5.1.0`](https://redirect.github.com/actions/cache/releases/tag/v5.1.0)

[Compare
Source](https://redirect.github.com/actions/cache/compare/v5.0.5...v5.1.0)

##### What's Changed

- Bump
[@&#8203;actions/cache](https://redirect.github.com/actions/cache) to
v5.1.0 - handle read-only cache access by
[@&#8203;jasongin](https://redirect.github.com/jasongin) in
[#&#8203;1775](https://redirect.github.com/actions/cache/pull/1775)

**Full Changelog**:
<actions/cache@v5...v5.1.0>

</details>

---

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.github/workflows/ci.yml

@@ -178,7 +178,7 @@ jobs:
       # job's wall time on a cold cache; the unpacked result is immutable for a
       # given manifest version, so cache it. Bump the key when bumping the
       # xwin version.
-      - uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      - uses: actions/cache/restore@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         id: xwin-cache
         with:
           path: ~/.cache/cargo-xwin
@@ -203,7 +203,7 @@ jobs:
           path: windows-tests.tar.zst
           retention-days: 7
 
-      - uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      - uses: actions/cache/save@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         if: steps.xwin-cache.outputs.cache-hit != 'true'
         with:
           path: ~/.cache/cargo-xwin