Bump actions/setup-node from 5 to 6 in the actions-infrastructure group

Bumps the actions-infrastructure group with 1 update: [actions/setup-node](https://github.com/actions/setup-node).


Updates `actions/setup-node` from 5 to 6
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v5...v6)

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

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

Author: dependabot[bot]

.github/workflows/deploy.yml

@@ -32,7 +32,7 @@ jobs:
                 python-version: 3.12
 
         -   name: Set up node
-            uses: actions/setup-node@v5
+            uses: actions/setup-node@v6
             with:
                 node-version: 24
 

.github/workflows/linkcheck.yml

@@ -32,7 +32,7 @@ jobs:
                 python-version: 3.12
 
         -   name: Set up node
-            uses: actions/setup-node@v5
+            uses: actions/setup-node@v6
             with:
                 node-version: 24
 

.github/workflows/validation.yml

@@ -34,7 +34,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
         -   uses: actions/checkout@v5
-        -   uses: actions/setup-node@v5
+        -   uses: actions/setup-node@v6
             with:
                 node-version: 22
         -   name: Run markdown style checks