Update actions/setup-node action to v6 (#127)

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

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           run_install: true # package manager version is in package.json
       - name: Setup Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "24"
           cache: pnpm

.github/workflows/fetch-event-node.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           run_install: true
       - name: Set up Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: '22.x' # Or any version you prefer
           cache: pnpm