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

Author: renovate[bot]

.github/workflows/build-deploy-obol-sdk.yml

@@ -16,7 +16,7 @@ jobs:
         with:
           persist-credentials: false # Required to make GitHub forget this checkout for the next step
 
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           node-version: '22.x'
           registry-url: 'https://registry.npmjs.org'

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
           node-version: 22.x
           cache: yarn

.github/workflows/release-pr.yml

@@ -25,7 +25,7 @@ jobs:
           git config user.email "${GITHUB_ACTOR}@users.noreply.github.com"
       
       - name: Setup node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
           node-version: 22.x
           cache: npm