chore(deps): 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/a11y.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 22
 

.github/workflows/ci.yml

@@ -81,7 +81,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0   # Nx affected commands need git history
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20.18.1
       - name: Enable pnpm
@@ -108,7 +108,7 @@ jobs:
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 8.0.x
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20.18.1
       - name: Enable pnpm

.github/workflows/lighthouse.yml

@@ -53,7 +53,7 @@ jobs:
         with:
           dotnet-version: 8.0.x
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 22
 

.github/workflows/sbom.yml

@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20.18.1
       - name: Enable pnpm