Bump actions/setup-node from 5 to 6 (pandas-dev#62764)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/unit-tests.yml

@@ -399,7 +399,7 @@ jobs:
           pyodide build
 
       - name: Set up Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: '20'