BREAKING CHANGE(github-action): Update actions/cache action v5 → v6 (#49542)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/cache](https://redirect.github.com/actions/cache) | action |
major | `caa2961` → `55cc834` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the [Dependency
Dashboard](../issues/18710) for more information.

Add the preset `:preserveSemverRanges` to your config if you don't want
to pin your dependencies.

---

### Release Notes

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

### [`v6`](https://redirect.github.com/actions/cache/compare/v5...v6)

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

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

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.github/workflows/charts-release.yaml

@@ -102,7 +102,7 @@ jobs:
       - name: Cache Changelog
         id: cache-changelog
         if: github.event_name == 'push'
-        uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6
         with:
           key: ${{ env.CHANGELOG_CACHE_KEY }}-${{ hashFiles('**/Chart.yaml') }}
           path: changelog.json.gz

.github/workflows/common-tests.yaml

@@ -103,7 +103,7 @@ jobs:
           version: ${{ matrix.helm-version }}
 
       - name: Cache helm plugins
-        uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6
         with:
           path: |
             /home/runner/.local/share/helm/plugins/helm-unittest