hopefully fixes last mistake

Author: elenirotsides

.github/workflows/fly-deploy.yml

@@ -9,8 +9,7 @@ jobs:
         steps:
             - name: Checkout code
               uses: actions/checkout@v2
-              with:
-                  node-version: '16.9.1'
+              uses: 'node16'
 
             - name: Set up Fly CLI
               uses: superfly/flyctl-actions/setup-flyctl@master