chore(deps): update actions/setup-node action to v6 (#134)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
 
@@ -38,7 +38,7 @@ jobs:
       # Yarn dependencies cannot be cached until yarn is installed
       # WORKAROUND: https://github.com/actions/setup-node/issues/531
       - name: Extract cached dependencies
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           cache: yarn