Use .node-version for test action

Author: probablykasper

.github/workflows/test.yml

@@ -8,9 +8,9 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Node.js setup
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version-file: '.node-version'
 
       - run: npm install