ci: use v6 actions/setup-node for integration tests

Author: FilipPyrek

.github/workflows/ci.yml

@@ -209,7 +209,7 @@ jobs:
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
 
       - name: Setup Node.js
-        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5
+        uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6
         with:
           cache: 'npm'
           node-version-file: '.nvmrc'