chore: update actions/setup-node action to v6 (#380)

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

Author: renovate[bot]

.github/workflows/push.yml

@@ -15,7 +15,7 @@ jobs:
             - uses: actions/checkout@v5
 
             - name: Setup node
-              uses: actions/setup-node@v5
+              uses: actions/setup-node@v6
               with:
                   node-version: ${{ matrix.node }}
                   cache: "npm"
@@ -45,7 +45,7 @@ jobs:
                   fetch-depth: 0
 
             - name: Use node ${{ matrix.node }}
-              uses: actions/setup-node@v5.0.0
+              uses: actions/setup-node@v6.0.0
               with:
                   cache: "npm"
                   node-version-file: ".nvmrc"
@@ -68,7 +68,7 @@ jobs:
             - uses: actions/checkout@v5
 
             - name: Setup node
-              uses: actions/setup-node@v5
+              uses: actions/setup-node@v6
               with:
                   node-version: ${{ matrix.node }}
                   cache: "npm"