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/pr-docs-tests.yml

@@ -23,7 +23,7 @@ jobs:
           path: docs/.vitepress/cache/@lando/mvb
           save-always: true
       - name: Install node ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: npm

.github/workflows/pr-linter.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
       - name: Install node ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: npm

.github/workflows/pr-nginx-tests.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
       - name: Install node ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           registry-url: https://registry.npmjs.org

.github/workflows/pr-unit-tests.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
       - name: Install node ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: npm

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
       - name: Install node ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           registry-url: https://registry.npmjs.org