Bump actions/setup-node from 4 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v4...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -35,7 +35,7 @@ jobs:
       with:
         ref: ${{ matrix.branch }}
 
-    - uses: actions/setup-node@v4
+    - uses: actions/setup-node@v6
       with:
         node-version: 16
 

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
 
-    - uses: actions/setup-node@v4
+    - uses: actions/setup-node@v6
       with:
         node-version: ${{ env.NODE_VERSION }}
 
@@ -40,7 +40,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
 
-    - uses: actions/setup-node@v4
+    - uses: actions/setup-node@v6
       with:
         node-version: ${{ env.NODE_VERSION }}
 
@@ -68,7 +68,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
 
-    - uses: actions/setup-node@v4
+    - uses: actions/setup-node@v6
       with:
         node-version: ${{ env.NODE_VERSION }}