chore(deps): update actions/setup-node action to v6 (#2006)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-node](https://redirect.github.com/actions/setup-node) |
action | major | `v5` -> `v6` |

---

### Release Notes

<details>
<summary>actions/setup-node (actions/setup-node)</summary>

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

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

</details>

---

### Configuration

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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
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---

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.github/workflows/docs.yaml

@@ -19,7 +19,7 @@ jobs:
         steps:
             -   uses: actions/checkout@v5
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'

.github/workflows/lychee.yml

@@ -12,7 +12,7 @@ jobs:
             -   uses: actions/checkout@v5
 
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'

.github/workflows/openapi.yaml

@@ -15,7 +15,7 @@ jobs:
             -   uses: actions/checkout@v5
 
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'

.github/workflows/publish-theme.yaml

@@ -18,7 +18,7 @@ jobs:
                     fetch-depth: 0
 
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'
@@ -46,7 +46,7 @@ jobs:
                     token: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}
 
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'

.github/workflows/test.yaml

@@ -14,7 +14,7 @@ jobs:
                 uses: actions/checkout@v5
 
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'
@@ -51,7 +51,7 @@ jobs:
                     separator: ","
 
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'
@@ -84,7 +84,7 @@ jobs:
                 uses: actions/checkout@v5
 
             -   name: Use Node.js 22
-                uses: actions/setup-node@v5
+                uses: actions/setup-node@v6
                 with:
                     node-version: 22
                     cache: 'npm'