use actions/setup-node@v2-beta

.github/workflows/list-unhealthy-branches.yml

@@ -13,10 +13,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - uses: actions/setup-node@v2
+    - uses: actions/setup-node@v2-beta
       with:
         node-version: '14'
-        check-latest: true
 
     - name: List branches
       id: list-branches