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/copilot-setup-steps.yml

@@ -17,7 +17,7 @@ jobs:
           persist-credentials: false
 
       - name: setup node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: 'npm'

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: setup node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: 'npm'

.github/workflows/package-check.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: setup node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: 'npm'

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: setup node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: 'npm'