Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       - id: nvmrc
         uses: browniebroke/read-nvmrc-action@v1
 
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           # use the output from the action
           node-version: '${{ steps.nvmrc.outputs.node_version }}'