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

Author: renovate[bot]

.github/workflows/generate-gateway-plugins-changelogs.yml

@@ -50,7 +50,7 @@ jobs:
           token: ${{ steps.app-token.outputs.token }}
 
       - name: Setup Node.js
-        uses: actions/setup-node@3235b876344d2a9aa001b8d1453c930bba69e610 # v3
+        uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6
         with:
           node-version: '24'
           cache: 'npm'

.github/workflows/generate-kong-conf-json.yml

@@ -51,7 +51,7 @@ jobs:
           token: ${{ steps.app-token.outputs.token }}
 
       - name: Setup Node.js
-        uses: actions/setup-node@3235b876344d2a9aa001b8d1453c930bba69e610 # v3
+        uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6
         with:
           node-version: '24'
           cache: 'npm'